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"""
This module contains definitions to build schemas which `pydantic_core` can
validate and serialize.
"""
from __future__ import annotations as _annotations
import sys
import warnings
from collections.abc import Mapping
from datetime import date, datetime, time, timedelta
from decimal import Decimal
from typing import TYPE_CHECKING, Any, Callable, Dict, Hashable, List, Pattern, Set, Tuple, Type, Union
from typing_extensions import deprecated
if sys.version_info < (3, 12):
from typing_extensions import TypedDict
else:
from typing import TypedDict
if sys.version_info < (3, 11):
from typing_extensions import Protocol, Required, TypeAlias
else:
from typing import Protocol, Required, TypeAlias
if sys.version_info < (3, 9):
from typing_extensions import Literal
else:
from typing import Literal
if TYPE_CHECKING:
from pydantic_core import PydanticUndefined
else:
# The initial build of pydantic_core requires PydanticUndefined to generate
# the core schema; so we need to conditionally skip it. mypy doesn't like
# this at all, hence the TYPE_CHECKING branch above.
try:
from pydantic_core import PydanticUndefined
except ImportError:
PydanticUndefined = object()
ExtraBehavior = Literal['allow', 'forbid', 'ignore']
class CoreConfig(TypedDict, total=False):
"""
Base class for schema configuration options.
Attributes:
title: The name of the configuration.
strict: Whether the configuration should strictly adhere to specified rules.
extra_fields_behavior: The behavior for handling extra fields.
typed_dict_total: Whether the TypedDict should be considered total. Default is `True`.
from_attributes: Whether to use attributes for models, dataclasses, and tagged union keys.
loc_by_alias: Whether to use the used alias (or first alias for "field required" errors) instead of
`field_names` to construct error `loc`s. Default is `True`.
revalidate_instances: Whether instances of models and dataclasses should re-validate. Default is 'never'.
validate_default: Whether to validate default values during validation. Default is `False`.
populate_by_name: Whether an aliased field may be populated by its name as given by the model attribute,
as well as the alias. (Replaces 'allow_population_by_field_name' in Pydantic v1.) Default is `False`.
str_max_length: The maximum length for string fields.
str_min_length: The minimum length for string fields.
str_strip_whitespace: Whether to strip whitespace from string fields.
str_to_lower: Whether to convert string fields to lowercase.
str_to_upper: Whether to convert string fields to uppercase.
allow_inf_nan: Whether to allow infinity and NaN values for float fields. Default is `True`.
ser_json_timedelta: The serialization option for `timedelta` values. Default is 'iso8601'.
ser_json_bytes: The serialization option for `bytes` values. Default is 'utf8'.
ser_json_inf_nan: The serialization option for infinity and NaN values
in float fields. Default is 'null'.
hide_input_in_errors: Whether to hide input data from `ValidationError` representation.
validation_error_cause: Whether to add user-python excs to the __cause__ of a ValidationError.
Requires exceptiongroup backport pre Python 3.11.
coerce_numbers_to_str: Whether to enable coercion of any `Number` type to `str` (not applicable in `strict` mode).
regex_engine: The regex engine to use for regex pattern validation. Default is 'rust-regex'. See `StringSchema`.
cache_strings: Whether to cache strings. Default is `True`, `True` or `'all'` is required to cache strings
during general validation since validators don't know if they're in a key or a value.
"""
title: str
strict: bool
# settings related to typed dicts, model fields, dataclass fields
extra_fields_behavior: ExtraBehavior
typed_dict_total: bool # default: True
# used for models, dataclasses, and tagged union keys
from_attributes: bool
# whether to use the used alias (or first alias for "field required" errors) instead of field_names
# to construct error `loc`s, default True
loc_by_alias: bool
# whether instances of models and dataclasses (including subclass instances) should re-validate, default 'never'
revalidate_instances: Literal['always', 'never', 'subclass-instances']
# whether to validate default values during validation, default False
validate_default: bool
# used on typed-dicts and arguments
populate_by_name: bool # replaces `allow_population_by_field_name` in pydantic v1
# fields related to string fields only
str_max_length: int
str_min_length: int
str_strip_whitespace: bool
str_to_lower: bool
str_to_upper: bool
# fields related to float fields only
allow_inf_nan: bool # default: True
# the config options are used to customise serialization to JSON
ser_json_timedelta: Literal['iso8601', 'float'] # default: 'iso8601'
ser_json_bytes: Literal['utf8', 'base64', 'hex'] # default: 'utf8'
ser_json_inf_nan: Literal['null', 'constants', 'strings'] # default: 'null'
# used to hide input data from ValidationError repr
hide_input_in_errors: bool
validation_error_cause: bool # default: False
coerce_numbers_to_str: bool # default: False
regex_engine: Literal['rust-regex', 'python-re'] # default: 'rust-regex'
cache_strings: Union[bool, Literal['all', 'keys', 'none']] # default: 'True'
IncExCall: TypeAlias = 'set[int | str] | dict[int | str, IncExCall] | None'
class SerializationInfo(Protocol):
@property
def include(self) -> IncExCall: ...
@property
def exclude(self) -> IncExCall: ...
@property
def context(self) -> Any | None:
"""Current serialization context."""
@property
def mode(self) -> str: ...
@property
def by_alias(self) -> bool: ...
@property
def exclude_unset(self) -> bool: ...
@property
def exclude_defaults(self) -> bool: ...
@property
def exclude_none(self) -> bool: ...
@property
def serialize_as_any(self) -> bool: ...
def round_trip(self) -> bool: ...
def mode_is_json(self) -> bool: ...
def __str__(self) -> str: ...
def __repr__(self) -> str: ...
class FieldSerializationInfo(SerializationInfo, Protocol):
@property
def field_name(self) -> str: ...
class ValidationInfo(Protocol):
"""
Argument passed to validation functions.
"""
@property
def context(self) -> Any | None:
"""Current validation context."""
...
@property
def config(self) -> CoreConfig | None:
"""The CoreConfig that applies to this validation."""
...
@property
def mode(self) -> Literal['python', 'json']:
"""The type of input data we are currently validating"""
...
@property
def data(self) -> Dict[str, Any]:
"""The data being validated for this model."""
...
@property
def field_name(self) -> str | None:
"""
The name of the current field being validated if this validator is
attached to a model field.
"""
...
ExpectedSerializationTypes = Literal[
'none',
'int',
'bool',
'float',
'str',
'bytes',
'bytearray',
'list',
'tuple',
'set',
'frozenset',
'generator',
'dict',
'datetime',
'date',
'time',
'timedelta',
'url',
'multi-host-url',
'json',
'uuid',
]
class SimpleSerSchema(TypedDict, total=False):
type: Required[ExpectedSerializationTypes]
def simple_ser_schema(type: ExpectedSerializationTypes) -> SimpleSerSchema:
"""
Returns a schema for serialization with a custom type.
Args:
type: The type to use for serialization
"""
return SimpleSerSchema(type=type)
# (input_value: Any, /) -> Any
GeneralPlainNoInfoSerializerFunction = Callable[[Any], Any]
# (input_value: Any, info: FieldSerializationInfo, /) -> Any
GeneralPlainInfoSerializerFunction = Callable[[Any, SerializationInfo], Any]
# (model: Any, input_value: Any, /) -> Any
FieldPlainNoInfoSerializerFunction = Callable[[Any, Any], Any]
# (model: Any, input_value: Any, info: FieldSerializationInfo, /) -> Any
FieldPlainInfoSerializerFunction = Callable[[Any, Any, FieldSerializationInfo], Any]
SerializerFunction = Union[
GeneralPlainNoInfoSerializerFunction,
GeneralPlainInfoSerializerFunction,
FieldPlainNoInfoSerializerFunction,
FieldPlainInfoSerializerFunction,
]
WhenUsed = Literal['always', 'unless-none', 'json', 'json-unless-none']
"""
Values have the following meanings:
* `'always'` means always use
* `'unless-none'` means use unless the value is `None`
* `'json'` means use when serializing to JSON
* `'json-unless-none'` means use when serializing to JSON and the value is not `None`
"""
class PlainSerializerFunctionSerSchema(TypedDict, total=False):
type: Required[Literal['function-plain']]
function: Required[SerializerFunction]
is_field_serializer: bool # default False
info_arg: bool # default False
return_schema: CoreSchema # if omitted, AnySchema is used
when_used: WhenUsed # default: 'always'
def plain_serializer_function_ser_schema(
function: SerializerFunction,
*,
is_field_serializer: bool | None = None,
info_arg: bool | None = None,
return_schema: CoreSchema | None = None,
when_used: WhenUsed = 'always',
) -> PlainSerializerFunctionSerSchema:
"""
Returns a schema for serialization with a function, can be either a "general" or "field" function.
Args:
function: The function to use for serialization
is_field_serializer: Whether the serializer is for a field, e.g. takes `model` as the first argument,
and `info` includes `field_name`
info_arg: Whether the function takes an `info` argument
return_schema: Schema to use for serializing return value
when_used: When the function should be called
"""
if when_used == 'always':
# just to avoid extra elements in schema, and to use the actual default defined in rust
when_used = None # type: ignore
return _dict_not_none(
type='function-plain',
function=function,
is_field_serializer=is_field_serializer,
info_arg=info_arg,
return_schema=return_schema,
when_used=when_used,
)
class SerializerFunctionWrapHandler(Protocol): # pragma: no cover
def __call__(self, input_value: Any, index_key: int | str | None = None, /) -> Any: ...
# (input_value: Any, serializer: SerializerFunctionWrapHandler, /) -> Any
GeneralWrapNoInfoSerializerFunction = Callable[[Any, SerializerFunctionWrapHandler], Any]
# (input_value: Any, serializer: SerializerFunctionWrapHandler, info: SerializationInfo, /) -> Any
GeneralWrapInfoSerializerFunction = Callable[[Any, SerializerFunctionWrapHandler, SerializationInfo], Any]
# (model: Any, input_value: Any, serializer: SerializerFunctionWrapHandler, /) -> Any
FieldWrapNoInfoSerializerFunction = Callable[[Any, Any, SerializerFunctionWrapHandler], Any]
# (model: Any, input_value: Any, serializer: SerializerFunctionWrapHandler, info: FieldSerializationInfo, /) -> Any
FieldWrapInfoSerializerFunction = Callable[[Any, Any, SerializerFunctionWrapHandler, FieldSerializationInfo], Any]
WrapSerializerFunction = Union[
GeneralWrapNoInfoSerializerFunction,
GeneralWrapInfoSerializerFunction,
FieldWrapNoInfoSerializerFunction,
FieldWrapInfoSerializerFunction,
]
class WrapSerializerFunctionSerSchema(TypedDict, total=False):
type: Required[Literal['function-wrap']]
function: Required[WrapSerializerFunction]
is_field_serializer: bool # default False
info_arg: bool # default False
schema: CoreSchema # if omitted, the schema on which this serializer is defined is used
return_schema: CoreSchema # if omitted, AnySchema is used
when_used: WhenUsed # default: 'always'
def wrap_serializer_function_ser_schema(
function: WrapSerializerFunction,
*,
is_field_serializer: bool | None = None,
info_arg: bool | None = None,
schema: CoreSchema | None = None,
return_schema: CoreSchema | None = None,
when_used: WhenUsed = 'always',
) -> WrapSerializerFunctionSerSchema:
"""
Returns a schema for serialization with a wrap function, can be either a "general" or "field" function.
Args:
function: The function to use for serialization
is_field_serializer: Whether the serializer is for a field, e.g. takes `model` as the first argument,
and `info` includes `field_name`
info_arg: Whether the function takes an `info` argument
schema: The schema to use for the inner serialization
return_schema: Schema to use for serializing return value
when_used: When the function should be called
"""
if when_used == 'always':
# just to avoid extra elements in schema, and to use the actual default defined in rust
when_used = None # type: ignore
return _dict_not_none(
type='function-wrap',
function=function,
is_field_serializer=is_field_serializer,
info_arg=info_arg,
schema=schema,
return_schema=return_schema,
when_used=when_used,
)
class FormatSerSchema(TypedDict, total=False):
type: Required[Literal['format']]
formatting_string: Required[str]
when_used: WhenUsed # default: 'json-unless-none'
def format_ser_schema(formatting_string: str, *, when_used: WhenUsed = 'json-unless-none') -> FormatSerSchema:
"""
Returns a schema for serialization using python's `format` method.
Args:
formatting_string: String defining the format to use
when_used: Same meaning as for [general_function_plain_ser_schema], but with a different default
"""
if when_used == 'json-unless-none':
# just to avoid extra elements in schema, and to use the actual default defined in rust
when_used = None # type: ignore
return _dict_not_none(type='format', formatting_string=formatting_string, when_used=when_used)
class ToStringSerSchema(TypedDict, total=False):
type: Required[Literal['to-string']]
when_used: WhenUsed # default: 'json-unless-none'
def to_string_ser_schema(*, when_used: WhenUsed = 'json-unless-none') -> ToStringSerSchema:
"""
Returns a schema for serialization using python's `str()` / `__str__` method.
Args:
when_used: Same meaning as for [general_function_plain_ser_schema], but with a different default
"""
s = dict(type='to-string')
if when_used != 'json-unless-none':
# just to avoid extra elements in schema, and to use the actual default defined in rust
s['when_used'] = when_used
return s # type: ignore
class ModelSerSchema(TypedDict, total=False):
type: Required[Literal['model']]
cls: Required[Type[Any]]
schema: Required[CoreSchema]
def model_ser_schema(cls: Type[Any], schema: CoreSchema) -> ModelSerSchema:
"""
Returns a schema for serialization using a model.
Args:
cls: The expected class type, used to generate warnings if the wrong type is passed
schema: Internal schema to use to serialize the model dict
"""
return ModelSerSchema(type='model', cls=cls, schema=schema)
SerSchema = Union[
SimpleSerSchema,
PlainSerializerFunctionSerSchema,
WrapSerializerFunctionSerSchema,
FormatSerSchema,
ToStringSerSchema,
ModelSerSchema,
]
class ComputedField(TypedDict, total=False):
type: Required[Literal['computed-field']]
property_name: Required[str]
return_schema: Required[CoreSchema]
alias: str
metadata: Any
def computed_field(
property_name: str, return_schema: CoreSchema, *, alias: str | None = None, metadata: Any = None
) -> ComputedField:
"""
ComputedFields are properties of a model or dataclass that are included in serialization.
Args:
property_name: The name of the property on the model or dataclass
return_schema: The schema used for the type returned by the computed field
alias: The name to use in the serialized output
metadata: Any other information you want to include with the schema, not used by pydantic-core
"""
return _dict_not_none(
type='computed-field', property_name=property_name, return_schema=return_schema, alias=alias, metadata=metadata
)
class AnySchema(TypedDict, total=False):
type: Required[Literal['any']]
ref: str
metadata: Any
serialization: SerSchema
def any_schema(*, ref: str | None = None, metadata: Any = None, serialization: SerSchema | None = None) -> AnySchema:
"""
Returns a schema that matches any value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.any_schema()
v = SchemaValidator(schema)
assert v.validate_python(1) == 1
```
Args:
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(type='any', ref=ref, metadata=metadata, serialization=serialization)
class NoneSchema(TypedDict, total=False):
type: Required[Literal['none']]
ref: str
metadata: Any
serialization: SerSchema
def none_schema(*, ref: str | None = None, metadata: Any = None, serialization: SerSchema | None = None) -> NoneSchema:
"""
Returns a schema that matches a None value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.none_schema()
v = SchemaValidator(schema)
assert v.validate_python(None) is None
```
Args:
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(type='none', ref=ref, metadata=metadata, serialization=serialization)
class BoolSchema(TypedDict, total=False):
type: Required[Literal['bool']]
strict: bool
ref: str
metadata: Any
serialization: SerSchema
def bool_schema(
strict: bool | None = None, ref: str | None = None, metadata: Any = None, serialization: SerSchema | None = None
) -> BoolSchema:
"""
Returns a schema that matches a bool value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.bool_schema()
v = SchemaValidator(schema)
assert v.validate_python('True') is True
```
Args:
strict: Whether the value should be a bool or a value that can be converted to a bool
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(type='bool', strict=strict, ref=ref, metadata=metadata, serialization=serialization)
class IntSchema(TypedDict, total=False):
type: Required[Literal['int']]
multiple_of: int
le: int
ge: int
lt: int
gt: int
strict: bool
ref: str
metadata: Any
serialization: SerSchema
def int_schema(
*,
multiple_of: int | None = None,
le: int | None = None,
ge: int | None = None,
lt: int | None = None,
gt: int | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> IntSchema:
"""
Returns a schema that matches a int value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.int_schema(multiple_of=2, le=6, ge=2)
v = SchemaValidator(schema)
assert v.validate_python('4') == 4
```
Args:
multiple_of: The value must be a multiple of this number
le: The value must be less than or equal to this number
ge: The value must be greater than or equal to this number
lt: The value must be strictly less than this number
gt: The value must be strictly greater than this number
strict: Whether the value should be a int or a value that can be converted to a int
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='int',
multiple_of=multiple_of,
le=le,
ge=ge,
lt=lt,
gt=gt,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class FloatSchema(TypedDict, total=False):
type: Required[Literal['float']]
allow_inf_nan: bool # whether 'NaN', '+inf', '-inf' should be forbidden. default: True
multiple_of: float
le: float
ge: float
lt: float
gt: float
strict: bool
ref: str
metadata: Any
serialization: SerSchema
def float_schema(
*,
allow_inf_nan: bool | None = None,
multiple_of: float | None = None,
le: float | None = None,
ge: float | None = None,
lt: float | None = None,
gt: float | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> FloatSchema:
"""
Returns a schema that matches a float value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.float_schema(le=0.8, ge=0.2)
v = SchemaValidator(schema)
assert v.validate_python('0.5') == 0.5
```
Args:
allow_inf_nan: Whether to allow inf and nan values
multiple_of: The value must be a multiple of this number
le: The value must be less than or equal to this number
ge: The value must be greater than or equal to this number
lt: The value must be strictly less than this number
gt: The value must be strictly greater than this number
strict: Whether the value should be a float or a value that can be converted to a float
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='float',
allow_inf_nan=allow_inf_nan,
multiple_of=multiple_of,
le=le,
ge=ge,
lt=lt,
gt=gt,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class DecimalSchema(TypedDict, total=False):
type: Required[Literal['decimal']]
allow_inf_nan: bool # whether 'NaN', '+inf', '-inf' should be forbidden. default: False
multiple_of: Decimal
le: Decimal
ge: Decimal
lt: Decimal
gt: Decimal
max_digits: int
decimal_places: int
strict: bool
ref: str
metadata: Any
serialization: SerSchema
def decimal_schema(
*,
allow_inf_nan: bool = None,
multiple_of: Decimal | None = None,
le: Decimal | None = None,
ge: Decimal | None = None,
lt: Decimal | None = None,
gt: Decimal | None = None,
max_digits: int | None = None,
decimal_places: int | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> DecimalSchema:
"""
Returns a schema that matches a decimal value, e.g.:
```py
from decimal import Decimal
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.decimal_schema(le=0.8, ge=0.2)
v = SchemaValidator(schema)
assert v.validate_python('0.5') == Decimal('0.5')
```
Args:
allow_inf_nan: Whether to allow inf and nan values
multiple_of: The value must be a multiple of this number
le: The value must be less than or equal to this number
ge: The value must be greater than or equal to this number
lt: The value must be strictly less than this number
gt: The value must be strictly greater than this number
max_digits: The maximum number of decimal digits allowed
decimal_places: The maximum number of decimal places allowed
strict: Whether the value should be a float or a value that can be converted to a float
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='decimal',
gt=gt,
ge=ge,
lt=lt,
le=le,
max_digits=max_digits,
decimal_places=decimal_places,
multiple_of=multiple_of,
allow_inf_nan=allow_inf_nan,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class StringSchema(TypedDict, total=False):
type: Required[Literal['str']]
pattern: Union[str, Pattern[str]]
max_length: int
min_length: int
strip_whitespace: bool
to_lower: bool
to_upper: bool
regex_engine: Literal['rust-regex', 'python-re'] # default: 'rust-regex'
strict: bool
coerce_numbers_to_str: bool
ref: str
metadata: Any
serialization: SerSchema
def str_schema(
*,
pattern: str | Pattern[str] | None = None,
max_length: int | None = None,
min_length: int | None = None,
strip_whitespace: bool | None = None,
to_lower: bool | None = None,
to_upper: bool | None = None,
regex_engine: Literal['rust-regex', 'python-re'] | None = None,
strict: bool | None = None,
coerce_numbers_to_str: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> StringSchema:
"""
Returns a schema that matches a string value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.str_schema(max_length=10, min_length=2)
v = SchemaValidator(schema)
assert v.validate_python('hello') == 'hello'
```
Args:
pattern: A regex pattern that the value must match
max_length: The value must be at most this length
min_length: The value must be at least this length
strip_whitespace: Whether to strip whitespace from the value
to_lower: Whether to convert the value to lowercase
to_upper: Whether to convert the value to uppercase
regex_engine: The regex engine to use for pattern validation. Default is 'rust-regex'.
- `rust-regex` uses the [`regex`](https://docs.rs/regex) Rust
crate, which is non-backtracking and therefore more DDoS
resistant, but does not support all regex features.
- `python-re` use the [`re`](https://docs.python.org/3/library/re.html) module,
which supports all regex features, but may be slower.
strict: Whether the value should be a string or a value that can be converted to a string
coerce_numbers_to_str: Whether to enable coercion of any `Number` type to `str` (not applicable in `strict` mode).
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='str',
pattern=pattern,
max_length=max_length,
min_length=min_length,
strip_whitespace=strip_whitespace,
to_lower=to_lower,
to_upper=to_upper,
regex_engine=regex_engine,
strict=strict,
coerce_numbers_to_str=coerce_numbers_to_str,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class BytesSchema(TypedDict, total=False):
type: Required[Literal['bytes']]
max_length: int
min_length: int
strict: bool
ref: str
metadata: Any
serialization: SerSchema
def bytes_schema(
*,
max_length: int | None = None,
min_length: int | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> BytesSchema:
"""
Returns a schema that matches a bytes value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.bytes_schema(max_length=10, min_length=2)
v = SchemaValidator(schema)
assert v.validate_python(b'hello') == b'hello'
```
Args:
max_length: The value must be at most this length
min_length: The value must be at least this length
strict: Whether the value should be a bytes or a value that can be converted to a bytes
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='bytes',
max_length=max_length,
min_length=min_length,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class DateSchema(TypedDict, total=False):
type: Required[Literal['date']]
strict: bool
le: date
ge: date
lt: date
gt: date
now_op: Literal['past', 'future']
# defaults to current local utc offset from `time.localtime().tm_gmtoff`
# value is restricted to -86_400 < offset < 86_400 by bounds in generate_self_schema.py
now_utc_offset: int
ref: str
metadata: Any
serialization: SerSchema
def date_schema(
*,
strict: bool | None = None,
le: date | None = None,
ge: date | None = None,
lt: date | None = None,
gt: date | None = None,
now_op: Literal['past', 'future'] | None = None,
now_utc_offset: int | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> DateSchema:
"""
Returns a schema that matches a date value, e.g.:
```py
from datetime import date
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.date_schema(le=date(2020, 1, 1), ge=date(2019, 1, 1))
v = SchemaValidator(schema)
assert v.validate_python(date(2019, 6, 1)) == date(2019, 6, 1)
```
Args:
strict: Whether the value should be a date or a value that can be converted to a date
le: The value must be less than or equal to this date
ge: The value must be greater than or equal to this date
lt: The value must be strictly less than this date
gt: The value must be strictly greater than this date
now_op: The value must be in the past or future relative to the current date
now_utc_offset: The value must be in the past or future relative to the current date with this utc offset
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='date',
strict=strict,
le=le,
ge=ge,
lt=lt,
gt=gt,
now_op=now_op,
now_utc_offset=now_utc_offset,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class TimeSchema(TypedDict, total=False):
type: Required[Literal['time']]
strict: bool
le: time
ge: time
lt: time
gt: time
tz_constraint: Union[Literal['aware', 'naive'], int]
microseconds_precision: Literal['truncate', 'error']
ref: str
metadata: Any
serialization: SerSchema
def time_schema(
*,
strict: bool | None = None,
le: time | None = None,
ge: time | None = None,
lt: time | None = None,
gt: time | None = None,
tz_constraint: Literal['aware', 'naive'] | int | None = None,
microseconds_precision: Literal['truncate', 'error'] = 'truncate',
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> TimeSchema:
"""
Returns a schema that matches a time value, e.g.:
```py
from datetime import time
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.time_schema(le=time(12, 0, 0), ge=time(6, 0, 0))
v = SchemaValidator(schema)
assert v.validate_python(time(9, 0, 0)) == time(9, 0, 0)
```
Args:
strict: Whether the value should be a time or a value that can be converted to a time
le: The value must be less than or equal to this time
ge: The value must be greater than or equal to this time
lt: The value must be strictly less than this time
gt: The value must be strictly greater than this time
tz_constraint: The value must be timezone aware or naive, or an int to indicate required tz offset
microseconds_precision: The behavior when seconds have more than 6 digits or microseconds is too large
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='time',
strict=strict,
le=le,
ge=ge,
lt=lt,
gt=gt,
tz_constraint=tz_constraint,
microseconds_precision=microseconds_precision,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class DatetimeSchema(TypedDict, total=False):
type: Required[Literal['datetime']]
strict: bool
le: datetime
ge: datetime
lt: datetime
gt: datetime
now_op: Literal['past', 'future']
tz_constraint: Union[Literal['aware', 'naive'], int]
# defaults to current local utc offset from `time.localtime().tm_gmtoff`
# value is restricted to -86_400 < offset < 86_400 by bounds in generate_self_schema.py
now_utc_offset: int
microseconds_precision: Literal['truncate', 'error'] # default: 'truncate'
ref: str
metadata: Any
serialization: SerSchema
def datetime_schema(
*,
strict: bool | None = None,
le: datetime | None = None,
ge: datetime | None = None,
lt: datetime | None = None,
gt: datetime | None = None,
now_op: Literal['past', 'future'] | None = None,
tz_constraint: Literal['aware', 'naive'] | int | None = None,
now_utc_offset: int | None = None,
microseconds_precision: Literal['truncate', 'error'] = 'truncate',
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> DatetimeSchema:
"""
Returns a schema that matches a datetime value, e.g.:
```py
from datetime import datetime
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.datetime_schema()
v = SchemaValidator(schema)
now = datetime.now()
assert v.validate_python(str(now)) == now
```
Args:
strict: Whether the value should be a datetime or a value that can be converted to a datetime
le: The value must be less than or equal to this datetime
ge: The value must be greater than or equal to this datetime
lt: The value must be strictly less than this datetime
gt: The value must be strictly greater than this datetime
now_op: The value must be in the past or future relative to the current datetime
tz_constraint: The value must be timezone aware or naive, or an int to indicate required tz offset
TODO: use of a tzinfo where offset changes based on the datetime is not yet supported
now_utc_offset: The value must be in the past or future relative to the current datetime with this utc offset
microseconds_precision: The behavior when seconds have more than 6 digits or microseconds is too large
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='datetime',
strict=strict,
le=le,
ge=ge,
lt=lt,
gt=gt,
now_op=now_op,
tz_constraint=tz_constraint,
now_utc_offset=now_utc_offset,
microseconds_precision=microseconds_precision,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class TimedeltaSchema(TypedDict, total=False):
type: Required[Literal['timedelta']]
strict: bool
le: timedelta
ge: timedelta
lt: timedelta
gt: timedelta
microseconds_precision: Literal['truncate', 'error']
ref: str
metadata: Any
serialization: SerSchema
def timedelta_schema(
*,
strict: bool | None = None,
le: timedelta | None = None,
ge: timedelta | None = None,
lt: timedelta | None = None,
gt: timedelta | None = None,
microseconds_precision: Literal['truncate', 'error'] = 'truncate',
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> TimedeltaSchema:
"""
Returns a schema that matches a timedelta value, e.g.:
```py
from datetime import timedelta
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.timedelta_schema(le=timedelta(days=1), ge=timedelta(days=0))
v = SchemaValidator(schema)
assert v.validate_python(timedelta(hours=12)) == timedelta(hours=12)
```
Args:
strict: Whether the value should be a timedelta or a value that can be converted to a timedelta
le: The value must be less than or equal to this timedelta
ge: The value must be greater than or equal to this timedelta
lt: The value must be strictly less than this timedelta
gt: The value must be strictly greater than this timedelta
microseconds_precision: The behavior when seconds have more than 6 digits or microseconds is too large
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='timedelta',
strict=strict,
le=le,
ge=ge,
lt=lt,
gt=gt,
microseconds_precision=microseconds_precision,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class LiteralSchema(TypedDict, total=False):
type: Required[Literal['literal']]
expected: Required[List[Any]]
ref: str
metadata: Any
serialization: SerSchema
def literal_schema(
expected: list[Any], *, ref: str | None = None, metadata: Any = None, serialization: SerSchema | None = None
) -> LiteralSchema:
"""
Returns a schema that matches a literal value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.literal_schema(['hello', 'world'])
v = SchemaValidator(schema)
assert v.validate_python('hello') == 'hello'
```
Args:
expected: The value must be one of these values
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(type='literal', expected=expected, ref=ref, metadata=metadata, serialization=serialization)
class EnumSchema(TypedDict, total=False):
type: Required[Literal['enum']]
cls: Required[Any]
members: Required[List[Any]]
sub_type: Literal['str', 'int', 'float']
missing: Callable[[Any], Any]
strict: bool
ref: str
metadata: Any
serialization: SerSchema
def enum_schema(
cls: Any,
members: list[Any],
*,
sub_type: Literal['str', 'int', 'float'] | None = None,
missing: Callable[[Any], Any] | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> EnumSchema:
"""
Returns a schema that matches an enum value, e.g.:
```py
from enum import Enum
from pydantic_core import SchemaValidator, core_schema
class Color(Enum):
RED = 1
GREEN = 2
BLUE = 3
schema = core_schema.enum_schema(Color, list(Color.__members__.values()))
v = SchemaValidator(schema)
assert v.validate_python(2) is Color.GREEN
```
Args:
cls: The enum class
members: The members of the enum, generally `list(MyEnum.__members__.values())`
sub_type: The type of the enum, either 'str' or 'int' or None for plain enums
missing: A function to use when the value is not found in the enum, from `_missing_`
strict: Whether to use strict mode, defaults to False
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='enum',
cls=cls,
members=members,
sub_type=sub_type,
missing=missing,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
# must match input/parse_json.rs::JsonType::try_from
JsonType = Literal['null', 'bool', 'int', 'float', 'str', 'list', 'dict']
class IsInstanceSchema(TypedDict, total=False):
type: Required[Literal['is-instance']]
cls: Required[Any]
cls_repr: str
ref: str
metadata: Any
serialization: SerSchema
def is_instance_schema(
cls: Any,
*,
cls_repr: str | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> IsInstanceSchema:
"""
Returns a schema that checks if a value is an instance of a class, equivalent to python's `isinstance` method, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
class A:
pass
schema = core_schema.is_instance_schema(cls=A)
v = SchemaValidator(schema)
v.validate_python(A())
```
Args:
cls: The value must be an instance of this class
cls_repr: If provided this string is used in the validator name instead of `repr(cls)`
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='is-instance', cls=cls, cls_repr=cls_repr, ref=ref, metadata=metadata, serialization=serialization
)
class IsSubclassSchema(TypedDict, total=False):
type: Required[Literal['is-subclass']]
cls: Required[Type[Any]]
cls_repr: str
ref: str
metadata: Any
serialization: SerSchema
def is_subclass_schema(
cls: Type[Any],
*,
cls_repr: str | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> IsInstanceSchema:
"""
Returns a schema that checks if a value is a subtype of a class, equivalent to python's `issubclass` method, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
class A:
pass
class B(A):
pass
schema = core_schema.is_subclass_schema(cls=A)
v = SchemaValidator(schema)
v.validate_python(B)
```
Args:
cls: The value must be a subclass of this class
cls_repr: If provided this string is used in the validator name instead of `repr(cls)`
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='is-subclass', cls=cls, cls_repr=cls_repr, ref=ref, metadata=metadata, serialization=serialization
)
class CallableSchema(TypedDict, total=False):
type: Required[Literal['callable']]
ref: str
metadata: Any
serialization: SerSchema
def callable_schema(
*, ref: str | None = None, metadata: Any = None, serialization: SerSchema | None = None
) -> CallableSchema:
"""
Returns a schema that checks if a value is callable, equivalent to python's `callable` method, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.callable_schema()
v = SchemaValidator(schema)
v.validate_python(min)
```
Args:
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(type='callable', ref=ref, metadata=metadata, serialization=serialization)
class UuidSchema(TypedDict, total=False):
type: Required[Literal['uuid']]
version: Literal[1, 3, 4, 5]
strict: bool
ref: str
metadata: Any
serialization: SerSchema
def uuid_schema(
*,
version: Literal[1, 3, 4, 5] | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> UuidSchema:
return _dict_not_none(
type='uuid', version=version, strict=strict, ref=ref, metadata=metadata, serialization=serialization
)
class IncExSeqSerSchema(TypedDict, total=False):
type: Required[Literal['include-exclude-sequence']]
include: Set[int]
exclude: Set[int]
def filter_seq_schema(*, include: Set[int] | None = None, exclude: Set[int] | None = None) -> IncExSeqSerSchema:
return _dict_not_none(type='include-exclude-sequence', include=include, exclude=exclude)
IncExSeqOrElseSerSchema = Union[IncExSeqSerSchema, SerSchema]
class ListSchema(TypedDict, total=False):
type: Required[Literal['list']]
items_schema: CoreSchema
min_length: int
max_length: int
fail_fast: bool
strict: bool
ref: str
metadata: Any
serialization: IncExSeqOrElseSerSchema
def list_schema(
items_schema: CoreSchema | None = None,
*,
min_length: int | None = None,
max_length: int | None = None,
fail_fast: bool | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: IncExSeqOrElseSerSchema | None = None,
) -> ListSchema:
"""
Returns a schema that matches a list value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.list_schema(core_schema.int_schema(), min_length=0, max_length=10)
v = SchemaValidator(schema)
assert v.validate_python(['4']) == [4]
```
Args:
items_schema: The value must be a list of items that match this schema
min_length: The value must be a list with at least this many items
max_length: The value must be a list with at most this many items
fail_fast: Stop validation on the first error
strict: The value must be a list with exactly this many items
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='list',
items_schema=items_schema,
min_length=min_length,
max_length=max_length,
fail_fast=fail_fast,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
# @deprecated('tuple_positional_schema is deprecated. Use pydantic_core.core_schema.tuple_schema instead.')
def tuple_positional_schema(
items_schema: list[CoreSchema],
*,
extras_schema: CoreSchema | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: IncExSeqOrElseSerSchema | None = None,
) -> TupleSchema:
"""
Returns a schema that matches a tuple of schemas, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.tuple_positional_schema(
[core_schema.int_schema(), core_schema.str_schema()]
)
v = SchemaValidator(schema)
assert v.validate_python((1, 'hello')) == (1, 'hello')
```
Args:
items_schema: The value must be a tuple with items that match these schemas
extras_schema: The value must be a tuple with items that match this schema
This was inspired by JSON schema's `prefixItems` and `items` fields.
In python's `typing.Tuple`, you can't specify a type for "extra" items -- they must all be the same type
if the length is variable. So this field won't be set from a `typing.Tuple` annotation on a pydantic model.
strict: The value must be a tuple with exactly this many items
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
if extras_schema is not None:
variadic_item_index = len(items_schema)
items_schema = items_schema + [extras_schema]
else:
variadic_item_index = None
return tuple_schema(
items_schema=items_schema,
variadic_item_index=variadic_item_index,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
# @deprecated('tuple_variable_schema is deprecated. Use pydantic_core.core_schema.tuple_schema instead.')
def tuple_variable_schema(
items_schema: CoreSchema | None = None,
*,
min_length: int | None = None,
max_length: int | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: IncExSeqOrElseSerSchema | None = None,
) -> TupleSchema:
"""
Returns a schema that matches a tuple of a given schema, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.tuple_variable_schema(
items_schema=core_schema.int_schema(), min_length=0, max_length=10
)
v = SchemaValidator(schema)
assert v.validate_python(('1', 2, 3)) == (1, 2, 3)
```
Args:
items_schema: The value must be a tuple with items that match this schema
min_length: The value must be a tuple with at least this many items
max_length: The value must be a tuple with at most this many items
strict: The value must be a tuple with exactly this many items
ref: Optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return tuple_schema(
items_schema=[items_schema or any_schema()],
variadic_item_index=0,
min_length=min_length,
max_length=max_length,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class TupleSchema(TypedDict, total=False):
type: Required[Literal['tuple']]
items_schema: Required[List[CoreSchema]]
variadic_item_index: int
min_length: int
max_length: int
fail_fast: bool
strict: bool
ref: str
metadata: Any
serialization: IncExSeqOrElseSerSchema
def tuple_schema(
items_schema: list[CoreSchema],
*,
variadic_item_index: int | None = None,
min_length: int | None = None,
max_length: int | None = None,
fail_fast: bool | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: IncExSeqOrElseSerSchema | None = None,
) -> TupleSchema:
"""
Returns a schema that matches a tuple of schemas, with an optional variadic item, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.tuple_schema(
[core_schema.int_schema(), core_schema.str_schema(), core_schema.float_schema()],
variadic_item_index=1,
)
v = SchemaValidator(schema)
assert v.validate_python((1, 'hello', 'world', 1.5)) == (1, 'hello', 'world', 1.5)
```
Args:
items_schema: The value must be a tuple with items that match these schemas
variadic_item_index: The index of the schema in `items_schema` to be treated as variadic (following PEP 646)
min_length: The value must be a tuple with at least this many items
max_length: The value must be a tuple with at most this many items
fail_fast: Stop validation on the first error
strict: The value must be a tuple with exactly this many items
ref: Optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='tuple',
items_schema=items_schema,
variadic_item_index=variadic_item_index,
min_length=min_length,
max_length=max_length,
fail_fast=fail_fast,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class SetSchema(TypedDict, total=False):
type: Required[Literal['set']]
items_schema: CoreSchema
min_length: int
max_length: int
fail_fast: bool
strict: bool
ref: str
metadata: Any
serialization: SerSchema
def set_schema(
items_schema: CoreSchema | None = None,
*,
min_length: int | None = None,
max_length: int | None = None,
fail_fast: bool | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> SetSchema:
"""
Returns a schema that matches a set of a given schema, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.set_schema(
items_schema=core_schema.int_schema(), min_length=0, max_length=10
)
v = SchemaValidator(schema)
assert v.validate_python({1, '2', 3}) == {1, 2, 3}
```
Args:
items_schema: The value must be a set with items that match this schema
min_length: The value must be a set with at least this many items
max_length: The value must be a set with at most this many items
fail_fast: Stop validation on the first error
strict: The value must be a set with exactly this many items
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='set',
items_schema=items_schema,
min_length=min_length,
max_length=max_length,
fail_fast=fail_fast,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class FrozenSetSchema(TypedDict, total=False):
type: Required[Literal['frozenset']]
items_schema: CoreSchema
min_length: int
max_length: int
fail_fast: bool
strict: bool
ref: str
metadata: Any
serialization: SerSchema
def frozenset_schema(
items_schema: CoreSchema | None = None,
*,
min_length: int | None = None,
max_length: int | None = None,
fail_fast: bool | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> FrozenSetSchema:
"""
Returns a schema that matches a frozenset of a given schema, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.frozenset_schema(
items_schema=core_schema.int_schema(), min_length=0, max_length=10
)
v = SchemaValidator(schema)
assert v.validate_python(frozenset(range(3))) == frozenset({0, 1, 2})
```
Args:
items_schema: The value must be a frozenset with items that match this schema
min_length: The value must be a frozenset with at least this many items
max_length: The value must be a frozenset with at most this many items
fail_fast: Stop validation on the first error
strict: The value must be a frozenset with exactly this many items
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='frozenset',
items_schema=items_schema,
min_length=min_length,
max_length=max_length,
fail_fast=fail_fast,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class GeneratorSchema(TypedDict, total=False):
type: Required[Literal['generator']]
items_schema: CoreSchema
min_length: int
max_length: int
ref: str
metadata: Any
serialization: IncExSeqOrElseSerSchema
def generator_schema(
items_schema: CoreSchema | None = None,
*,
min_length: int | None = None,
max_length: int | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: IncExSeqOrElseSerSchema | None = None,
) -> GeneratorSchema:
"""
Returns a schema that matches a generator value, e.g.:
```py
from typing import Iterator
from pydantic_core import SchemaValidator, core_schema
def gen() -> Iterator[int]:
yield 1
schema = core_schema.generator_schema(items_schema=core_schema.int_schema())
v = SchemaValidator(schema)
v.validate_python(gen())
```
Unlike other types, validated generators do not raise ValidationErrors eagerly,
but instead will raise a ValidationError when a violating value is actually read from the generator.
This is to ensure that "validated" generators retain the benefit of lazy evaluation.
Args:
items_schema: The value must be a generator with items that match this schema
min_length: The value must be a generator that yields at least this many items
max_length: The value must be a generator that yields at most this many items
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='generator',
items_schema=items_schema,
min_length=min_length,
max_length=max_length,
ref=ref,
metadata=metadata,
serialization=serialization,
)
IncExDict = Set[Union[int, str]]
class IncExDictSerSchema(TypedDict, total=False):
type: Required[Literal['include-exclude-dict']]
include: IncExDict
exclude: IncExDict
def filter_dict_schema(*, include: IncExDict | None = None, exclude: IncExDict | None = None) -> IncExDictSerSchema:
return _dict_not_none(type='include-exclude-dict', include=include, exclude=exclude)
IncExDictOrElseSerSchema = Union[IncExDictSerSchema, SerSchema]
class DictSchema(TypedDict, total=False):
type: Required[Literal['dict']]
keys_schema: CoreSchema # default: AnySchema
values_schema: CoreSchema # default: AnySchema
min_length: int
max_length: int
strict: bool
ref: str
metadata: Any
serialization: IncExDictOrElseSerSchema
def dict_schema(
keys_schema: CoreSchema | None = None,
values_schema: CoreSchema | None = None,
*,
min_length: int | None = None,
max_length: int | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> DictSchema:
"""
Returns a schema that matches a dict value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.dict_schema(
keys_schema=core_schema.str_schema(), values_schema=core_schema.int_schema()
)
v = SchemaValidator(schema)
assert v.validate_python({'a': '1', 'b': 2}) == {'a': 1, 'b': 2}
```
Args:
keys_schema: The value must be a dict with keys that match this schema
values_schema: The value must be a dict with values that match this schema
min_length: The value must be a dict with at least this many items
max_length: The value must be a dict with at most this many items
strict: Whether the keys and values should be validated with strict mode
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='dict',
keys_schema=keys_schema,
values_schema=values_schema,
min_length=min_length,
max_length=max_length,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
# (input_value: Any, /) -> Any
NoInfoValidatorFunction = Callable[[Any], Any]
class NoInfoValidatorFunctionSchema(TypedDict):
type: Literal['no-info']
function: NoInfoValidatorFunction
# (input_value: Any, info: ValidationInfo, /) -> Any
WithInfoValidatorFunction = Callable[[Any, ValidationInfo], Any]
class WithInfoValidatorFunctionSchema(TypedDict, total=False):
type: Required[Literal['with-info']]
function: Required[WithInfoValidatorFunction]
field_name: str
ValidationFunction = Union[NoInfoValidatorFunctionSchema, WithInfoValidatorFunctionSchema]
class _ValidatorFunctionSchema(TypedDict, total=False):
function: Required[ValidationFunction]
schema: Required[CoreSchema]
ref: str
metadata: Any
serialization: SerSchema
class BeforeValidatorFunctionSchema(_ValidatorFunctionSchema, total=False):
type: Required[Literal['function-before']]
def no_info_before_validator_function(
function: NoInfoValidatorFunction,
schema: CoreSchema,
*,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> BeforeValidatorFunctionSchema:
"""
Returns a schema that calls a validator function before validating, no `info` argument is provided, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
def fn(v: bytes) -> str:
return v.decode() + 'world'
func_schema = core_schema.no_info_before_validator_function(
function=fn, schema=core_schema.str_schema()
)
schema = core_schema.typed_dict_schema({'a': core_schema.typed_dict_field(func_schema)})
v = SchemaValidator(schema)
assert v.validate_python({'a': b'hello '}) == {'a': 'hello world'}
```
Args:
function: The validator function to call
schema: The schema to validate the output of the validator function
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='function-before',
function={'type': 'no-info', 'function': function},
schema=schema,
ref=ref,
metadata=metadata,
serialization=serialization,
)
def with_info_before_validator_function(
function: WithInfoValidatorFunction,
schema: CoreSchema,
*,
field_name: str | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> BeforeValidatorFunctionSchema:
"""
Returns a schema that calls a validator function before validation, the function is called with
an `info` argument, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
def fn(v: bytes, info: core_schema.ValidationInfo) -> str:
assert info.data is not None
assert info.field_name is not None
return v.decode() + 'world'
func_schema = core_schema.with_info_before_validator_function(
function=fn, schema=core_schema.str_schema(), field_name='a'
)
schema = core_schema.typed_dict_schema({'a': core_schema.typed_dict_field(func_schema)})
v = SchemaValidator(schema)
assert v.validate_python({'a': b'hello '}) == {'a': 'hello world'}
```
Args:
function: The validator function to call
field_name: The name of the field
schema: The schema to validate the output of the validator function
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='function-before',
function=_dict_not_none(type='with-info', function=function, field_name=field_name),
schema=schema,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class AfterValidatorFunctionSchema(_ValidatorFunctionSchema, total=False):
type: Required[Literal['function-after']]
def no_info_after_validator_function(
function: NoInfoValidatorFunction,
schema: CoreSchema,
*,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> AfterValidatorFunctionSchema:
"""
Returns a schema that calls a validator function after validating, no `info` argument is provided, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
def fn(v: str) -> str:
return v + 'world'
func_schema = core_schema.no_info_after_validator_function(fn, core_schema.str_schema())
schema = core_schema.typed_dict_schema({'a': core_schema.typed_dict_field(func_schema)})
v = SchemaValidator(schema)
assert v.validate_python({'a': b'hello '}) == {'a': 'hello world'}
```
Args:
function: The validator function to call after the schema is validated
schema: The schema to validate before the validator function
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='function-after',
function={'type': 'no-info', 'function': function},
schema=schema,
ref=ref,
metadata=metadata,
serialization=serialization,
)
def with_info_after_validator_function(
function: WithInfoValidatorFunction,
schema: CoreSchema,
*,
field_name: str | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> AfterValidatorFunctionSchema:
"""
Returns a schema that calls a validator function after validation, the function is called with
an `info` argument, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
def fn(v: str, info: core_schema.ValidationInfo) -> str:
assert info.data is not None
assert info.field_name is not None
return v + 'world'
func_schema = core_schema.with_info_after_validator_function(
function=fn, schema=core_schema.str_schema(), field_name='a'
)
schema = core_schema.typed_dict_schema({'a': core_schema.typed_dict_field(func_schema)})
v = SchemaValidator(schema)
assert v.validate_python({'a': b'hello '}) == {'a': 'hello world'}
```
Args:
function: The validator function to call after the schema is validated
schema: The schema to validate before the validator function
field_name: The name of the field this validators is applied to, if any
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='function-after',
function=_dict_not_none(type='with-info', function=function, field_name=field_name),
schema=schema,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class ValidatorFunctionWrapHandler(Protocol):
def __call__(self, input_value: Any, outer_location: str | int | None = None, /) -> Any: # pragma: no cover
...
# (input_value: Any, validator: ValidatorFunctionWrapHandler, /) -> Any
NoInfoWrapValidatorFunction = Callable[[Any, ValidatorFunctionWrapHandler], Any]
class NoInfoWrapValidatorFunctionSchema(TypedDict):
type: Literal['no-info']
function: NoInfoWrapValidatorFunction
# (input_value: Any, validator: ValidatorFunctionWrapHandler, info: ValidationInfo, /) -> Any
WithInfoWrapValidatorFunction = Callable[[Any, ValidatorFunctionWrapHandler, ValidationInfo], Any]
class WithInfoWrapValidatorFunctionSchema(TypedDict, total=False):
type: Required[Literal['with-info']]
function: Required[WithInfoWrapValidatorFunction]
field_name: str
WrapValidatorFunction = Union[NoInfoWrapValidatorFunctionSchema, WithInfoWrapValidatorFunctionSchema]
class WrapValidatorFunctionSchema(TypedDict, total=False):
type: Required[Literal['function-wrap']]
function: Required[WrapValidatorFunction]
schema: Required[CoreSchema]
ref: str
metadata: Any
serialization: SerSchema
def no_info_wrap_validator_function(
function: NoInfoWrapValidatorFunction,
schema: CoreSchema,
*,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> WrapValidatorFunctionSchema:
"""
Returns a schema which calls a function with a `validator` callable argument which can
optionally be used to call inner validation with the function logic, this is much like the
"onion" implementation of middleware in many popular web frameworks, no `info` argument is passed, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
def fn(
v: str,
validator: core_schema.ValidatorFunctionWrapHandler,
) -> str:
return validator(input_value=v) + 'world'
schema = core_schema.no_info_wrap_validator_function(
function=fn, schema=core_schema.str_schema()
)
v = SchemaValidator(schema)
assert v.validate_python('hello ') == 'hello world'
```
Args:
function: The validator function to call
schema: The schema to validate the output of the validator function
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='function-wrap',
function={'type': 'no-info', 'function': function},
schema=schema,
ref=ref,
metadata=metadata,
serialization=serialization,
)
def with_info_wrap_validator_function(
function: WithInfoWrapValidatorFunction,
schema: CoreSchema,
*,
field_name: str | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> WrapValidatorFunctionSchema:
"""
Returns a schema which calls a function with a `validator` callable argument which can
optionally be used to call inner validation with the function logic, this is much like the
"onion" implementation of middleware in many popular web frameworks, an `info` argument is also passed, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
def fn(
v: str,
validator: core_schema.ValidatorFunctionWrapHandler,
info: core_schema.ValidationInfo,
) -> str:
return validator(input_value=v) + 'world'
schema = core_schema.with_info_wrap_validator_function(
function=fn, schema=core_schema.str_schema()
)
v = SchemaValidator(schema)
assert v.validate_python('hello ') == 'hello world'
```
Args:
function: The validator function to call
schema: The schema to validate the output of the validator function
field_name: The name of the field this validators is applied to, if any
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='function-wrap',
function=_dict_not_none(type='with-info', function=function, field_name=field_name),
schema=schema,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class PlainValidatorFunctionSchema(TypedDict, total=False):
type: Required[Literal['function-plain']]
function: Required[ValidationFunction]
ref: str
metadata: Any
serialization: SerSchema
def no_info_plain_validator_function(
function: NoInfoValidatorFunction,
*,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> PlainValidatorFunctionSchema:
"""
Returns a schema that uses the provided function for validation, no `info` argument is passed, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
def fn(v: str) -> str:
assert 'hello' in v
return v + 'world'
schema = core_schema.no_info_plain_validator_function(function=fn)
v = SchemaValidator(schema)
assert v.validate_python('hello ') == 'hello world'
```
Args:
function: The validator function to call
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='function-plain',
function={'type': 'no-info', 'function': function},
ref=ref,
metadata=metadata,
serialization=serialization,
)
def with_info_plain_validator_function(
function: WithInfoValidatorFunction,
*,
field_name: str | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> PlainValidatorFunctionSchema:
"""
Returns a schema that uses the provided function for validation, an `info` argument is passed, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
def fn(v: str, info: core_schema.ValidationInfo) -> str:
assert 'hello' in v
return v + 'world'
schema = core_schema.with_info_plain_validator_function(function=fn)
v = SchemaValidator(schema)
assert v.validate_python('hello ') == 'hello world'
```
Args:
function: The validator function to call
field_name: The name of the field this validators is applied to, if any
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='function-plain',
function=_dict_not_none(type='with-info', function=function, field_name=field_name),
ref=ref,
metadata=metadata,
serialization=serialization,
)
class WithDefaultSchema(TypedDict, total=False):
type: Required[Literal['default']]
schema: Required[CoreSchema]
default: Any
default_factory: Callable[[], Any]
on_error: Literal['raise', 'omit', 'default'] # default: 'raise'
validate_default: bool # default: False
strict: bool
ref: str
metadata: Any
serialization: SerSchema
def with_default_schema(
schema: CoreSchema,
*,
default: Any = PydanticUndefined,
default_factory: Callable[[], Any] | None = None,
on_error: Literal['raise', 'omit', 'default'] | None = None,
validate_default: bool | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> WithDefaultSchema:
"""
Returns a schema that adds a default value to the given schema, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.with_default_schema(core_schema.str_schema(), default='hello')
wrapper_schema = core_schema.typed_dict_schema(
{'a': core_schema.typed_dict_field(schema)}
)
v = SchemaValidator(wrapper_schema)
assert v.validate_python({}) == v.validate_python({'a': 'hello'})
```
Args:
schema: The schema to add a default value to
default: The default value to use
default_factory: A function that returns the default value to use
on_error: What to do if the schema validation fails. One of 'raise', 'omit', 'default'
validate_default: Whether the default value should be validated
strict: Whether the underlying schema should be validated with strict mode
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
s = _dict_not_none(
type='default',
schema=schema,
default_factory=default_factory,
on_error=on_error,
validate_default=validate_default,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
if default is not PydanticUndefined:
s['default'] = default
return s
class NullableSchema(TypedDict, total=False):
type: Required[Literal['nullable']]
schema: Required[CoreSchema]
strict: bool
ref: str
metadata: Any
serialization: SerSchema
def nullable_schema(
schema: CoreSchema,
*,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> NullableSchema:
"""
Returns a schema that matches a nullable value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.nullable_schema(core_schema.str_schema())
v = SchemaValidator(schema)
assert v.validate_python(None) is None
```
Args:
schema: The schema to wrap
strict: Whether the underlying schema should be validated with strict mode
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='nullable', schema=schema, strict=strict, ref=ref, metadata=metadata, serialization=serialization
)
class UnionSchema(TypedDict, total=False):
type: Required[Literal['union']]
choices: Required[List[Union[CoreSchema, Tuple[CoreSchema, str]]]]
# default true, whether to automatically collapse unions with one element to the inner validator
auto_collapse: bool
custom_error_type: str
custom_error_message: str
custom_error_context: Dict[str, Union[str, int, float]]
mode: Literal['smart', 'left_to_right'] # default: 'smart'
strict: bool
ref: str
metadata: Any
serialization: SerSchema
def union_schema(
choices: list[CoreSchema | tuple[CoreSchema, str]],
*,
auto_collapse: bool | None = None,
custom_error_type: str | None = None,
custom_error_message: str | None = None,
custom_error_context: dict[str, str | int] | None = None,
mode: Literal['smart', 'left_to_right'] | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> UnionSchema:
"""
Returns a schema that matches a union value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.union_schema([core_schema.str_schema(), core_schema.int_schema()])
v = SchemaValidator(schema)
assert v.validate_python('hello') == 'hello'
assert v.validate_python(1) == 1
```
Args:
choices: The schemas to match. If a tuple, the second item is used as the label for the case.
auto_collapse: whether to automatically collapse unions with one element to the inner validator, default true
custom_error_type: The custom error type to use if the validation fails
custom_error_message: The custom error message to use if the validation fails
custom_error_context: The custom error context to use if the validation fails
mode: How to select which choice to return
* `smart` (default) will try to return the choice which is the closest match to the input value
* `left_to_right` will return the first choice in `choices` which succeeds validation
strict: Whether the underlying schemas should be validated with strict mode
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='union',
choices=choices,
auto_collapse=auto_collapse,
custom_error_type=custom_error_type,
custom_error_message=custom_error_message,
custom_error_context=custom_error_context,
mode=mode,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class TaggedUnionSchema(TypedDict, total=False):
type: Required[Literal['tagged-union']]
choices: Required[Dict[Hashable, CoreSchema]]
discriminator: Required[Union[str, List[Union[str, int]], List[List[Union[str, int]]], Callable[[Any], Hashable]]]
custom_error_type: str
custom_error_message: str
custom_error_context: Dict[str, Union[str, int, float]]
strict: bool
from_attributes: bool # default: True
ref: str
metadata: Any
serialization: SerSchema
def tagged_union_schema(
choices: Dict[Any, CoreSchema],
discriminator: str | list[str | int] | list[list[str | int]] | Callable[[Any], Any],
*,
custom_error_type: str | None = None,
custom_error_message: str | None = None,
custom_error_context: dict[str, int | str | float] | None = None,
strict: bool | None = None,
from_attributes: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> TaggedUnionSchema:
"""
Returns a schema that matches a tagged union value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
apple_schema = core_schema.typed_dict_schema(
{
'foo': core_schema.typed_dict_field(core_schema.str_schema()),
'bar': core_schema.typed_dict_field(core_schema.int_schema()),
}
)
banana_schema = core_schema.typed_dict_schema(
{
'foo': core_schema.typed_dict_field(core_schema.str_schema()),
'spam': core_schema.typed_dict_field(
core_schema.list_schema(items_schema=core_schema.int_schema())
),
}
)
schema = core_schema.tagged_union_schema(
choices={
'apple': apple_schema,
'banana': banana_schema,
},
discriminator='foo',
)
v = SchemaValidator(schema)
assert v.validate_python({'foo': 'apple', 'bar': '123'}) == {'foo': 'apple', 'bar': 123}
assert v.validate_python({'foo': 'banana', 'spam': [1, 2, 3]}) == {
'foo': 'banana',
'spam': [1, 2, 3],
}
```
Args:
choices: The schemas to match
When retrieving a schema from `choices` using the discriminator value, if the value is a str,
it should be fed back into the `choices` map until a schema is obtained
(This approach is to prevent multiple ownership of a single schema in Rust)
discriminator: The discriminator to use to determine the schema to use
* If `discriminator` is a str, it is the name of the attribute to use as the discriminator
* If `discriminator` is a list of int/str, it should be used as a "path" to access the discriminator
* If `discriminator` is a list of lists, each inner list is a path, and the first path that exists is used
* If `discriminator` is a callable, it should return the discriminator when called on the value to validate;
the callable can return `None` to indicate that there is no matching discriminator present on the input
custom_error_type: The custom error type to use if the validation fails
custom_error_message: The custom error message to use if the validation fails
custom_error_context: The custom error context to use if the validation fails
strict: Whether the underlying schemas should be validated with strict mode
from_attributes: Whether to use the attributes of the object to retrieve the discriminator value
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='tagged-union',
choices=choices,
discriminator=discriminator,
custom_error_type=custom_error_type,
custom_error_message=custom_error_message,
custom_error_context=custom_error_context,
strict=strict,
from_attributes=from_attributes,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class ChainSchema(TypedDict, total=False):
type: Required[Literal['chain']]
steps: Required[List[CoreSchema]]
ref: str
metadata: Any
serialization: SerSchema
def chain_schema(
steps: list[CoreSchema], *, ref: str | None = None, metadata: Any = None, serialization: SerSchema | None = None
) -> ChainSchema:
"""
Returns a schema that chains the provided validation schemas, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
def fn(v: str, info: core_schema.ValidationInfo) -> str:
assert 'hello' in v
return v + ' world'
fn_schema = core_schema.with_info_plain_validator_function(function=fn)
schema = core_schema.chain_schema(
[fn_schema, fn_schema, fn_schema, core_schema.str_schema()]
)
v = SchemaValidator(schema)
assert v.validate_python('hello') == 'hello world world world'
```
Args:
steps: The schemas to chain
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(type='chain', steps=steps, ref=ref, metadata=metadata, serialization=serialization)
class LaxOrStrictSchema(TypedDict, total=False):
type: Required[Literal['lax-or-strict']]
lax_schema: Required[CoreSchema]
strict_schema: Required[CoreSchema]
strict: bool
ref: str
metadata: Any
serialization: SerSchema
def lax_or_strict_schema(
lax_schema: CoreSchema,
strict_schema: CoreSchema,
*,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> LaxOrStrictSchema:
"""
Returns a schema that uses the lax or strict schema, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
def fn(v: str, info: core_schema.ValidationInfo) -> str:
assert 'hello' in v
return v + ' world'
lax_schema = core_schema.int_schema(strict=False)
strict_schema = core_schema.int_schema(strict=True)
schema = core_schema.lax_or_strict_schema(
lax_schema=lax_schema, strict_schema=strict_schema, strict=True
)
v = SchemaValidator(schema)
assert v.validate_python(123) == 123
schema = core_schema.lax_or_strict_schema(
lax_schema=lax_schema, strict_schema=strict_schema, strict=False
)
v = SchemaValidator(schema)
assert v.validate_python('123') == 123
```
Args:
lax_schema: The lax schema to use
strict_schema: The strict schema to use
strict: Whether the strict schema should be used
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='lax-or-strict',
lax_schema=lax_schema,
strict_schema=strict_schema,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class JsonOrPythonSchema(TypedDict, total=False):
type: Required[Literal['json-or-python']]
json_schema: Required[CoreSchema]
python_schema: Required[CoreSchema]
ref: str
metadata: Any
serialization: SerSchema
def json_or_python_schema(
json_schema: CoreSchema,
python_schema: CoreSchema,
*,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> JsonOrPythonSchema:
"""
Returns a schema that uses the Json or Python schema depending on the input:
```py
from pydantic_core import SchemaValidator, ValidationError, core_schema
v = SchemaValidator(
core_schema.json_or_python_schema(
json_schema=core_schema.int_schema(),
python_schema=core_schema.int_schema(strict=True),
)
)
assert v.validate_json('"123"') == 123
try:
v.validate_python('123')
except ValidationError:
pass
else:
raise AssertionError('Validation should have failed')
```
Args:
json_schema: The schema to use for Json inputs
python_schema: The schema to use for Python inputs
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='json-or-python',
json_schema=json_schema,
python_schema=python_schema,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class TypedDictField(TypedDict, total=False):
type: Required[Literal['typed-dict-field']]
schema: Required[CoreSchema]
required: bool
validation_alias: Union[str, List[Union[str, int]], List[List[Union[str, int]]]]
serialization_alias: str
serialization_exclude: bool # default: False
metadata: Any
def typed_dict_field(
schema: CoreSchema,
*,
required: bool | None = None,
validation_alias: str | list[str | int] | list[list[str | int]] | None = None,
serialization_alias: str | None = None,
serialization_exclude: bool | None = None,
metadata: Any = None,
) -> TypedDictField:
"""
Returns a schema that matches a typed dict field, e.g.:
```py
from pydantic_core import core_schema
field = core_schema.typed_dict_field(schema=core_schema.int_schema(), required=True)
```
Args:
schema: The schema to use for the field
required: Whether the field is required
validation_alias: The alias(es) to use to find the field in the validation data
serialization_alias: The alias to use as a key when serializing
serialization_exclude: Whether to exclude the field when serializing
metadata: Any other information you want to include with the schema, not used by pydantic-core
"""
return _dict_not_none(
type='typed-dict-field',
schema=schema,
required=required,
validation_alias=validation_alias,
serialization_alias=serialization_alias,
serialization_exclude=serialization_exclude,
metadata=metadata,
)
class TypedDictSchema(TypedDict, total=False):
type: Required[Literal['typed-dict']]
fields: Required[Dict[str, TypedDictField]]
computed_fields: List[ComputedField]
strict: bool
extras_schema: CoreSchema
# all these values can be set via config, equivalent fields have `typed_dict_` prefix
extra_behavior: ExtraBehavior
total: bool # default: True
populate_by_name: bool # replaces `allow_population_by_field_name` in pydantic v1
ref: str
metadata: Any
serialization: SerSchema
config: CoreConfig
def typed_dict_schema(
fields: Dict[str, TypedDictField],
*,
computed_fields: list[ComputedField] | None = None,
strict: bool | None = None,
extras_schema: CoreSchema | None = None,
extra_behavior: ExtraBehavior | None = None,
total: bool | None = None,
populate_by_name: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
config: CoreConfig | None = None,
) -> TypedDictSchema:
"""
Returns a schema that matches a typed dict, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
wrapper_schema = core_schema.typed_dict_schema(
{'a': core_schema.typed_dict_field(core_schema.str_schema())}
)
v = SchemaValidator(wrapper_schema)
assert v.validate_python({'a': 'hello'}) == {'a': 'hello'}
```
Args:
fields: The fields to use for the typed dict
computed_fields: Computed fields to use when serializing the model, only applies when directly inside a model
strict: Whether the typed dict is strict
extras_schema: The extra validator to use for the typed dict
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
extra_behavior: The extra behavior to use for the typed dict
total: Whether the typed dict is total
populate_by_name: Whether the typed dict should populate by name
serialization: Custom serialization schema
"""
return _dict_not_none(
type='typed-dict',
fields=fields,
computed_fields=computed_fields,
strict=strict,
extras_schema=extras_schema,
extra_behavior=extra_behavior,
total=total,
populate_by_name=populate_by_name,
ref=ref,
metadata=metadata,
serialization=serialization,
config=config,
)
class ModelField(TypedDict, total=False):
type: Required[Literal['model-field']]
schema: Required[CoreSchema]
validation_alias: Union[str, List[Union[str, int]], List[List[Union[str, int]]]]
serialization_alias: str
serialization_exclude: bool # default: False
frozen: bool
metadata: Any
def model_field(
schema: CoreSchema,
*,
validation_alias: str | list[str | int] | list[list[str | int]] | None = None,
serialization_alias: str | None = None,
serialization_exclude: bool | None = None,
frozen: bool | None = None,
metadata: Any = None,
) -> ModelField:
"""
Returns a schema for a model field, e.g.:
```py
from pydantic_core import core_schema
field = core_schema.model_field(schema=core_schema.int_schema())
```
Args:
schema: The schema to use for the field
validation_alias: The alias(es) to use to find the field in the validation data
serialization_alias: The alias to use as a key when serializing
serialization_exclude: Whether to exclude the field when serializing
frozen: Whether the field is frozen
metadata: Any other information you want to include with the schema, not used by pydantic-core
"""
return _dict_not_none(
type='model-field',
schema=schema,
validation_alias=validation_alias,
serialization_alias=serialization_alias,
serialization_exclude=serialization_exclude,
frozen=frozen,
metadata=metadata,
)
class ModelFieldsSchema(TypedDict, total=False):
type: Required[Literal['model-fields']]
fields: Required[Dict[str, ModelField]]
model_name: str
computed_fields: List[ComputedField]
strict: bool
extras_schema: CoreSchema
# all these values can be set via config, equivalent fields have `typed_dict_` prefix
extra_behavior: ExtraBehavior
populate_by_name: bool # replaces `allow_population_by_field_name` in pydantic v1
from_attributes: bool
ref: str
metadata: Any
serialization: SerSchema
def model_fields_schema(
fields: Dict[str, ModelField],
*,
model_name: str | None = None,
computed_fields: list[ComputedField] | None = None,
strict: bool | None = None,
extras_schema: CoreSchema | None = None,
extra_behavior: ExtraBehavior | None = None,
populate_by_name: bool | None = None,
from_attributes: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> ModelFieldsSchema:
"""
Returns a schema that matches a typed dict, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
wrapper_schema = core_schema.model_fields_schema(
{'a': core_schema.model_field(core_schema.str_schema())}
)
v = SchemaValidator(wrapper_schema)
print(v.validate_python({'a': 'hello'}))
#> ({'a': 'hello'}, None, {'a'})
```
Args:
fields: The fields to use for the typed dict
model_name: The name of the model, used for error messages, defaults to "Model"
computed_fields: Computed fields to use when serializing the model, only applies when directly inside a model
strict: Whether the typed dict is strict
extras_schema: The extra validator to use for the typed dict
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
extra_behavior: The extra behavior to use for the typed dict
populate_by_name: Whether the typed dict should populate by name
from_attributes: Whether the typed dict should be populated from attributes
serialization: Custom serialization schema
"""
return _dict_not_none(
type='model-fields',
fields=fields,
model_name=model_name,
computed_fields=computed_fields,
strict=strict,
extras_schema=extras_schema,
extra_behavior=extra_behavior,
populate_by_name=populate_by_name,
from_attributes=from_attributes,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class ModelSchema(TypedDict, total=False):
type: Required[Literal['model']]
cls: Required[Type[Any]]
schema: Required[CoreSchema]
custom_init: bool
root_model: bool
post_init: str
revalidate_instances: Literal['always', 'never', 'subclass-instances'] # default: 'never'
strict: bool
frozen: bool
extra_behavior: ExtraBehavior
config: CoreConfig
ref: str
metadata: Any
serialization: SerSchema
def model_schema(
cls: Type[Any],
schema: CoreSchema,
*,
custom_init: bool | None = None,
root_model: bool | None = None,
post_init: str | None = None,
revalidate_instances: Literal['always', 'never', 'subclass-instances'] | None = None,
strict: bool | None = None,
frozen: bool | None = None,
extra_behavior: ExtraBehavior | None = None,
config: CoreConfig | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> ModelSchema:
"""
A model schema generally contains a typed-dict schema.
It will run the typed dict validator, then create a new class
and set the dict and fields set returned from the typed dict validator
to `__dict__` and `__pydantic_fields_set__` respectively.
Example:
```py
from pydantic_core import CoreConfig, SchemaValidator, core_schema
class MyModel:
__slots__ = (
'__dict__',
'__pydantic_fields_set__',
'__pydantic_extra__',
'__pydantic_private__',
)
schema = core_schema.model_schema(
cls=MyModel,
config=CoreConfig(str_max_length=5),
schema=core_schema.model_fields_schema(
fields={'a': core_schema.model_field(core_schema.str_schema())},
),
)
v = SchemaValidator(schema)
assert v.isinstance_python({'a': 'hello'}) is True
assert v.isinstance_python({'a': 'too long'}) is False
```
Args:
cls: The class to use for the model
schema: The schema to use for the model
custom_init: Whether the model has a custom init method
root_model: Whether the model is a `RootModel`
post_init: The call after init to use for the model
revalidate_instances: whether instances of models and dataclasses (including subclass instances)
should re-validate defaults to config.revalidate_instances, else 'never'
strict: Whether the model is strict
frozen: Whether the model is frozen
extra_behavior: The extra behavior to use for the model, used in serialization
config: The config to use for the model
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='model',
cls=cls,
schema=schema,
custom_init=custom_init,
root_model=root_model,
post_init=post_init,
revalidate_instances=revalidate_instances,
strict=strict,
frozen=frozen,
extra_behavior=extra_behavior,
config=config,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class DataclassField(TypedDict, total=False):
type: Required[Literal['dataclass-field']]
name: Required[str]
schema: Required[CoreSchema]
kw_only: bool # default: True
init: bool # default: True
init_only: bool # default: False
frozen: bool # default: False
validation_alias: Union[str, List[Union[str, int]], List[List[Union[str, int]]]]
serialization_alias: str
serialization_exclude: bool # default: False
metadata: Any
def dataclass_field(
name: str,
schema: CoreSchema,
*,
kw_only: bool | None = None,
init: bool | None = None,
init_only: bool | None = None,
validation_alias: str | list[str | int] | list[list[str | int]] | None = None,
serialization_alias: str | None = None,
serialization_exclude: bool | None = None,
metadata: Any = None,
frozen: bool | None = None,
) -> DataclassField:
"""
Returns a schema for a dataclass field, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
field = core_schema.dataclass_field(
name='a', schema=core_schema.str_schema(), kw_only=False
)
schema = core_schema.dataclass_args_schema('Foobar', [field])
v = SchemaValidator(schema)
assert v.validate_python({'a': 'hello'}) == ({'a': 'hello'}, None)
```
Args:
name: The name to use for the argument parameter
schema: The schema to use for the argument parameter
kw_only: Whether the field can be set with a positional argument as well as a keyword argument
init: Whether the field should be validated during initialization
init_only: Whether the field should be omitted from `__dict__` and passed to `__post_init__`
validation_alias: The alias(es) to use to find the field in the validation data
serialization_alias: The alias to use as a key when serializing
serialization_exclude: Whether to exclude the field when serializing
metadata: Any other information you want to include with the schema, not used by pydantic-core
frozen: Whether the field is frozen
"""
return _dict_not_none(
type='dataclass-field',
name=name,
schema=schema,
kw_only=kw_only,
init=init,
init_only=init_only,
validation_alias=validation_alias,
serialization_alias=serialization_alias,
serialization_exclude=serialization_exclude,
metadata=metadata,
frozen=frozen,
)
class DataclassArgsSchema(TypedDict, total=False):
type: Required[Literal['dataclass-args']]
dataclass_name: Required[str]
fields: Required[List[DataclassField]]
computed_fields: List[ComputedField]
populate_by_name: bool # default: False
collect_init_only: bool # default: False
ref: str
metadata: Any
serialization: SerSchema
extra_behavior: ExtraBehavior
def dataclass_args_schema(
dataclass_name: str,
fields: list[DataclassField],
*,
computed_fields: List[ComputedField] | None = None,
populate_by_name: bool | None = None,
collect_init_only: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
extra_behavior: ExtraBehavior | None = None,
) -> DataclassArgsSchema:
"""
Returns a schema for validating dataclass arguments, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
field_a = core_schema.dataclass_field(
name='a', schema=core_schema.str_schema(), kw_only=False
)
field_b = core_schema.dataclass_field(
name='b', schema=core_schema.bool_schema(), kw_only=False
)
schema = core_schema.dataclass_args_schema('Foobar', [field_a, field_b])
v = SchemaValidator(schema)
assert v.validate_python({'a': 'hello', 'b': True}) == ({'a': 'hello', 'b': True}, None)
```
Args:
dataclass_name: The name of the dataclass being validated
fields: The fields to use for the dataclass
computed_fields: Computed fields to use when serializing the dataclass
populate_by_name: Whether to populate by name
collect_init_only: Whether to collect init only fields into a dict to pass to `__post_init__`
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
extra_behavior: How to handle extra fields
"""
return _dict_not_none(
type='dataclass-args',
dataclass_name=dataclass_name,
fields=fields,
computed_fields=computed_fields,
populate_by_name=populate_by_name,
collect_init_only=collect_init_only,
ref=ref,
metadata=metadata,
serialization=serialization,
extra_behavior=extra_behavior,
)
class DataclassSchema(TypedDict, total=False):
type: Required[Literal['dataclass']]
cls: Required[Type[Any]]
schema: Required[CoreSchema]
fields: Required[List[str]]
cls_name: str
post_init: bool # default: False
revalidate_instances: Literal['always', 'never', 'subclass-instances'] # default: 'never'
strict: bool # default: False
frozen: bool # default False
ref: str
metadata: Any
serialization: SerSchema
slots: bool
config: CoreConfig
def dataclass_schema(
cls: Type[Any],
schema: CoreSchema,
fields: List[str],
*,
cls_name: str | None = None,
post_init: bool | None = None,
revalidate_instances: Literal['always', 'never', 'subclass-instances'] | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
frozen: bool | None = None,
slots: bool | None = None,
config: CoreConfig | None = None,
) -> DataclassSchema:
"""
Returns a schema for a dataclass. As with `ModelSchema`, this schema can only be used as a field within
another schema, not as the root type.
Args:
cls: The dataclass type, used to perform subclass checks
schema: The schema to use for the dataclass fields
fields: Fields of the dataclass, this is used in serialization and in validation during re-validation
and while validating assignment
cls_name: The name to use in error locs, etc; this is useful for generics (default: `cls.__name__`)
post_init: Whether to call `__post_init__` after validation
revalidate_instances: whether instances of models and dataclasses (including subclass instances)
should re-validate defaults to config.revalidate_instances, else 'never'
strict: Whether to require an exact instance of `cls`
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
frozen: Whether the dataclass is frozen
slots: Whether `slots=True` on the dataclass, means each field is assigned independently, rather than
simply setting `__dict__`, default false
"""
return _dict_not_none(
type='dataclass',
cls=cls,
fields=fields,
cls_name=cls_name,
schema=schema,
post_init=post_init,
revalidate_instances=revalidate_instances,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
frozen=frozen,
slots=slots,
config=config,
)
class ArgumentsParameter(TypedDict, total=False):
name: Required[str]
schema: Required[CoreSchema]
mode: Literal['positional_only', 'positional_or_keyword', 'keyword_only'] # default positional_or_keyword
alias: Union[str, List[Union[str, int]], List[List[Union[str, int]]]]
def arguments_parameter(
name: str,
schema: CoreSchema,
*,
mode: Literal['positional_only', 'positional_or_keyword', 'keyword_only'] | None = None,
alias: str | list[str | int] | list[list[str | int]] | None = None,
) -> ArgumentsParameter:
"""
Returns a schema that matches an argument parameter, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
param = core_schema.arguments_parameter(
name='a', schema=core_schema.str_schema(), mode='positional_only'
)
schema = core_schema.arguments_schema([param])
v = SchemaValidator(schema)
assert v.validate_python(('hello',)) == (('hello',), {})
```
Args:
name: The name to use for the argument parameter
schema: The schema to use for the argument parameter
mode: The mode to use for the argument parameter
alias: The alias to use for the argument parameter
"""
return _dict_not_none(name=name, schema=schema, mode=mode, alias=alias)
class ArgumentsSchema(TypedDict, total=False):
type: Required[Literal['arguments']]
arguments_schema: Required[List[ArgumentsParameter]]
populate_by_name: bool
var_args_schema: CoreSchema
var_kwargs_schema: CoreSchema
ref: str
metadata: Any
serialization: SerSchema
def arguments_schema(
arguments: list[ArgumentsParameter],
*,
populate_by_name: bool | None = None,
var_args_schema: CoreSchema | None = None,
var_kwargs_schema: CoreSchema | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> ArgumentsSchema:
"""
Returns a schema that matches an arguments schema, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
param_a = core_schema.arguments_parameter(
name='a', schema=core_schema.str_schema(), mode='positional_only'
)
param_b = core_schema.arguments_parameter(
name='b', schema=core_schema.bool_schema(), mode='positional_only'
)
schema = core_schema.arguments_schema([param_a, param_b])
v = SchemaValidator(schema)
assert v.validate_python(('hello', True)) == (('hello', True), {})
```
Args:
arguments: The arguments to use for the arguments schema
populate_by_name: Whether to populate by name
var_args_schema: The variable args schema to use for the arguments schema
var_kwargs_schema: The variable kwargs schema to use for the arguments schema
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='arguments',
arguments_schema=arguments,
populate_by_name=populate_by_name,
var_args_schema=var_args_schema,
var_kwargs_schema=var_kwargs_schema,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class CallSchema(TypedDict, total=False):
type: Required[Literal['call']]
arguments_schema: Required[CoreSchema]
function: Required[Callable[..., Any]]
function_name: str # default function.__name__
return_schema: CoreSchema
ref: str
metadata: Any
serialization: SerSchema
def call_schema(
arguments: CoreSchema,
function: Callable[..., Any],
*,
function_name: str | None = None,
return_schema: CoreSchema | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> CallSchema:
"""
Returns a schema that matches an arguments schema, then calls a function, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
param_a = core_schema.arguments_parameter(
name='a', schema=core_schema.str_schema(), mode='positional_only'
)
param_b = core_schema.arguments_parameter(
name='b', schema=core_schema.bool_schema(), mode='positional_only'
)
args_schema = core_schema.arguments_schema([param_a, param_b])
schema = core_schema.call_schema(
arguments=args_schema,
function=lambda a, b: a + str(not b),
return_schema=core_schema.str_schema(),
)
v = SchemaValidator(schema)
assert v.validate_python((('hello', True))) == 'helloFalse'
```
Args:
arguments: The arguments to use for the arguments schema
function: The function to use for the call schema
function_name: The function name to use for the call schema, if not provided `function.__name__` is used
return_schema: The return schema to use for the call schema
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='call',
arguments_schema=arguments,
function=function,
function_name=function_name,
return_schema=return_schema,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class CustomErrorSchema(TypedDict, total=False):
type: Required[Literal['custom-error']]
schema: Required[CoreSchema]
custom_error_type: Required[str]
custom_error_message: str
custom_error_context: Dict[str, Union[str, int, float]]
ref: str
metadata: Any
serialization: SerSchema
def custom_error_schema(
schema: CoreSchema,
custom_error_type: str,
*,
custom_error_message: str | None = None,
custom_error_context: dict[str, Any] | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> CustomErrorSchema:
"""
Returns a schema that matches a custom error value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.custom_error_schema(
schema=core_schema.int_schema(),
custom_error_type='MyError',
custom_error_message='Error msg',
)
v = SchemaValidator(schema)
v.validate_python(1)
```
Args:
schema: The schema to use for the custom error schema
custom_error_type: The custom error type to use for the custom error schema
custom_error_message: The custom error message to use for the custom error schema
custom_error_context: The custom error context to use for the custom error schema
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='custom-error',
schema=schema,
custom_error_type=custom_error_type,
custom_error_message=custom_error_message,
custom_error_context=custom_error_context,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class JsonSchema(TypedDict, total=False):
type: Required[Literal['json']]
schema: CoreSchema
ref: str
metadata: Any
serialization: SerSchema
def json_schema(
schema: CoreSchema | None = None,
*,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> JsonSchema:
"""
Returns a schema that matches a JSON value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
dict_schema = core_schema.model_fields_schema(
{
'field_a': core_schema.model_field(core_schema.str_schema()),
'field_b': core_schema.model_field(core_schema.bool_schema()),
},
)
class MyModel:
__slots__ = (
'__dict__',
'__pydantic_fields_set__',
'__pydantic_extra__',
'__pydantic_private__',
)
field_a: str
field_b: bool
json_schema = core_schema.json_schema(schema=dict_schema)
schema = core_schema.model_schema(cls=MyModel, schema=json_schema)
v = SchemaValidator(schema)
m = v.validate_python('{"field_a": "hello", "field_b": true}')
assert isinstance(m, MyModel)
```
Args:
schema: The schema to use for the JSON schema
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(type='json', schema=schema, ref=ref, metadata=metadata, serialization=serialization)
class UrlSchema(TypedDict, total=False):
type: Required[Literal['url']]
max_length: int
allowed_schemes: List[str]
host_required: bool # default False
default_host: str
default_port: int
default_path: str
strict: bool
ref: str
metadata: Any
serialization: SerSchema
def url_schema(
*,
max_length: int | None = None,
allowed_schemes: list[str] | None = None,
host_required: bool | None = None,
default_host: str | None = None,
default_port: int | None = None,
default_path: str | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> UrlSchema:
"""
Returns a schema that matches a URL value, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.url_schema()
v = SchemaValidator(schema)
print(v.validate_python('https://example.com'))
#> https://example.com/
```
Args:
max_length: The maximum length of the URL
allowed_schemes: The allowed URL schemes
host_required: Whether the URL must have a host
default_host: The default host to use if the URL does not have a host
default_port: The default port to use if the URL does not have a port
default_path: The default path to use if the URL does not have a path
strict: Whether to use strict URL parsing
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='url',
max_length=max_length,
allowed_schemes=allowed_schemes,
host_required=host_required,
default_host=default_host,
default_port=default_port,
default_path=default_path,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class MultiHostUrlSchema(TypedDict, total=False):
type: Required[Literal['multi-host-url']]
max_length: int
allowed_schemes: List[str]
host_required: bool # default False
default_host: str
default_port: int
default_path: str
strict: bool
ref: str
metadata: Any
serialization: SerSchema
def multi_host_url_schema(
*,
max_length: int | None = None,
allowed_schemes: list[str] | None = None,
host_required: bool | None = None,
default_host: str | None = None,
default_port: int | None = None,
default_path: str | None = None,
strict: bool | None = None,
ref: str | None = None,
metadata: Any = None,
serialization: SerSchema | None = None,
) -> MultiHostUrlSchema:
"""
Returns a schema that matches a URL value with possibly multiple hosts, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.multi_host_url_schema()
v = SchemaValidator(schema)
print(v.validate_python('redis://localhost,0.0.0.0,127.0.0.1'))
#> redis://localhost,0.0.0.0,127.0.0.1
```
Args:
max_length: The maximum length of the URL
allowed_schemes: The allowed URL schemes
host_required: Whether the URL must have a host
default_host: The default host to use if the URL does not have a host
default_port: The default port to use if the URL does not have a port
default_path: The default path to use if the URL does not have a path
strict: Whether to use strict URL parsing
ref: optional unique identifier of the schema, used to reference the schema in other places
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='multi-host-url',
max_length=max_length,
allowed_schemes=allowed_schemes,
host_required=host_required,
default_host=default_host,
default_port=default_port,
default_path=default_path,
strict=strict,
ref=ref,
metadata=metadata,
serialization=serialization,
)
class DefinitionsSchema(TypedDict, total=False):
type: Required[Literal['definitions']]
schema: Required[CoreSchema]
definitions: Required[List[CoreSchema]]
metadata: Any
serialization: SerSchema
def definitions_schema(schema: CoreSchema, definitions: list[CoreSchema]) -> DefinitionsSchema:
"""
Build a schema that contains both an inner schema and a list of definitions which can be used
within the inner schema.
```py
from pydantic_core import SchemaValidator, core_schema
schema = core_schema.definitions_schema(
core_schema.list_schema(core_schema.definition_reference_schema('foobar')),
[core_schema.int_schema(ref='foobar')],
)
v = SchemaValidator(schema)
assert v.validate_python([1, 2, '3']) == [1, 2, 3]
```
Args:
schema: The inner schema
definitions: List of definitions which can be referenced within inner schema
"""
return DefinitionsSchema(type='definitions', schema=schema, definitions=definitions)
class DefinitionReferenceSchema(TypedDict, total=False):
type: Required[Literal['definition-ref']]
schema_ref: Required[str]
ref: str
metadata: Any
serialization: SerSchema
def definition_reference_schema(
schema_ref: str, ref: str | None = None, metadata: Any = None, serialization: SerSchema | None = None
) -> DefinitionReferenceSchema:
"""
Returns a schema that points to a schema stored in "definitions", this is useful for nested recursive
models and also when you want to define validators separately from the main schema, e.g.:
```py
from pydantic_core import SchemaValidator, core_schema
schema_definition = core_schema.definition_reference_schema('list-schema')
schema = core_schema.definitions_schema(
schema=schema_definition,
definitions=[
core_schema.list_schema(items_schema=schema_definition, ref='list-schema'),
],
)
v = SchemaValidator(schema)
assert v.validate_python([()]) == [[]]
```
Args:
schema_ref: The schema ref to use for the definition reference schema
metadata: Any other information you want to include with the schema, not used by pydantic-core
serialization: Custom serialization schema
"""
return _dict_not_none(
type='definition-ref', schema_ref=schema_ref, ref=ref, metadata=metadata, serialization=serialization
)
MYPY = False
# See https://github.com/python/mypy/issues/14034 for details, in summary mypy is extremely slow to process this
# union which kills performance not just for pydantic, but even for code using pydantic
if not MYPY:
CoreSchema = Union[
AnySchema,
NoneSchema,
BoolSchema,
IntSchema,
FloatSchema,
DecimalSchema,
StringSchema,
BytesSchema,
DateSchema,
TimeSchema,
DatetimeSchema,
TimedeltaSchema,
LiteralSchema,
EnumSchema,
IsInstanceSchema,
IsSubclassSchema,
CallableSchema,
ListSchema,
TupleSchema,
SetSchema,
FrozenSetSchema,
GeneratorSchema,
DictSchema,
AfterValidatorFunctionSchema,
BeforeValidatorFunctionSchema,
WrapValidatorFunctionSchema,
PlainValidatorFunctionSchema,
WithDefaultSchema,
NullableSchema,
UnionSchema,
TaggedUnionSchema,
ChainSchema,
LaxOrStrictSchema,
JsonOrPythonSchema,
TypedDictSchema,
ModelFieldsSchema,
ModelSchema,
DataclassArgsSchema,
DataclassSchema,
ArgumentsSchema,
CallSchema,
CustomErrorSchema,
JsonSchema,
UrlSchema,
MultiHostUrlSchema,
DefinitionsSchema,
DefinitionReferenceSchema,
UuidSchema,
]
elif False:
CoreSchema: TypeAlias = Mapping[str, Any]
# to update this, call `pytest -k test_core_schema_type_literal` and copy the output
CoreSchemaType = Literal[
'any',
'none',
'bool',
'int',
'float',
'decimal',
'str',
'bytes',
'date',
'time',
'datetime',
'timedelta',
'literal',
'enum',
'is-instance',
'is-subclass',
'callable',
'list',
'tuple',
'set',
'frozenset',
'generator',
'dict',
'function-after',
'function-before',
'function-wrap',
'function-plain',
'default',
'nullable',
'union',
'tagged-union',
'chain',
'lax-or-strict',
'json-or-python',
'typed-dict',
'model-fields',
'model',
'dataclass-args',
'dataclass',
'arguments',
'call',
'custom-error',
'json',
'url',
'multi-host-url',
'definitions',
'definition-ref',
'uuid',
]
CoreSchemaFieldType = Literal['model-field', 'dataclass-field', 'typed-dict-field', 'computed-field']
# used in _pydantic_core.pyi::PydanticKnownError
# to update this, call `pytest -k test_all_errors` and copy the output
ErrorType = Literal[
'no_such_attribute',
'json_invalid',
'json_type',
'recursion_loop',
'missing',
'frozen_field',
'frozen_instance',
'extra_forbidden',
'invalid_key',
'get_attribute_error',
'model_type',
'model_attributes_type',
'dataclass_type',
'dataclass_exact_type',
'none_required',
'greater_than',
'greater_than_equal',
'less_than',
'less_than_equal',
'multiple_of',
'finite_number',
'too_short',
'too_long',
'iterable_type',
'iteration_error',
'string_type',
'string_sub_type',
'string_unicode',
'string_too_short',
'string_too_long',
'string_pattern_mismatch',
'enum',
'dict_type',
'mapping_type',
'list_type',
'tuple_type',
'set_type',
'bool_type',
'bool_parsing',
'int_type',
'int_parsing',
'int_parsing_size',
'int_from_float',
'float_type',
'float_parsing',
'bytes_type',
'bytes_too_short',
'bytes_too_long',
'value_error',
'assertion_error',
'literal_error',
'date_type',
'date_parsing',
'date_from_datetime_parsing',
'date_from_datetime_inexact',
'date_past',
'date_future',
'time_type',
'time_parsing',
'datetime_type',
'datetime_parsing',
'datetime_object_invalid',
'datetime_from_date_parsing',
'datetime_past',
'datetime_future',
'timezone_naive',
'timezone_aware',
'timezone_offset',
'time_delta_type',
'time_delta_parsing',
'frozen_set_type',
'is_instance_of',
'is_subclass_of',
'callable_type',
'union_tag_invalid',
'union_tag_not_found',
'arguments_type',
'missing_argument',
'unexpected_keyword_argument',
'missing_keyword_only_argument',
'unexpected_positional_argument',
'missing_positional_only_argument',
'multiple_argument_values',
'url_type',
'url_parsing',
'url_syntax_violation',
'url_too_long',
'url_scheme',
'uuid_type',
'uuid_parsing',
'uuid_version',
'decimal_type',
'decimal_parsing',
'decimal_max_digits',
'decimal_max_places',
'decimal_whole_digits',
]
def _dict_not_none(**kwargs: Any) -> Any:
return {k: v for k, v in kwargs.items() if v is not None}
###############################################################################
# All this stuff is deprecated by #980 and will be removed eventually
# They're kept because some code external code will be using them
@deprecated('`field_before_validator_function` is deprecated, use `with_info_before_validator_function` instead.')
def field_before_validator_function(function: WithInfoValidatorFunction, field_name: str, schema: CoreSchema, **kwargs):
warnings.warn(
'`field_before_validator_function` is deprecated, use `with_info_before_validator_function` instead.',
DeprecationWarning,
)
return with_info_before_validator_function(function, schema, field_name=field_name, **kwargs)
@deprecated('`general_before_validator_function` is deprecated, use `with_info_before_validator_function` instead.')
def general_before_validator_function(*args, **kwargs):
warnings.warn(
'`general_before_validator_function` is deprecated, use `with_info_before_validator_function` instead.',
DeprecationWarning,
)
return with_info_before_validator_function(*args, **kwargs)
@deprecated('`field_after_validator_function` is deprecated, use `with_info_after_validator_function` instead.')
def field_after_validator_function(function: WithInfoValidatorFunction, field_name: str, schema: CoreSchema, **kwargs):
warnings.warn(
'`field_after_validator_function` is deprecated, use `with_info_after_validator_function` instead.',
DeprecationWarning,
)
return with_info_after_validator_function(function, schema, field_name=field_name, **kwargs)
@deprecated('`general_after_validator_function` is deprecated, use `with_info_after_validator_function` instead.')
def general_after_validator_function(*args, **kwargs):
warnings.warn(
'`general_after_validator_function` is deprecated, use `with_info_after_validator_function` instead.',
DeprecationWarning,
)
return with_info_after_validator_function(*args, **kwargs)
@deprecated('`field_wrap_validator_function` is deprecated, use `with_info_wrap_validator_function` instead.')
def field_wrap_validator_function(
function: WithInfoWrapValidatorFunction, field_name: str, schema: CoreSchema, **kwargs
):
warnings.warn(
'`field_wrap_validator_function` is deprecated, use `with_info_wrap_validator_function` instead.',
DeprecationWarning,
)
return with_info_wrap_validator_function(function, schema, field_name=field_name, **kwargs)
@deprecated('`general_wrap_validator_function` is deprecated, use `with_info_wrap_validator_function` instead.')
def general_wrap_validator_function(*args, **kwargs):
warnings.warn(
'`general_wrap_validator_function` is deprecated, use `with_info_wrap_validator_function` instead.',
DeprecationWarning,
)
return with_info_wrap_validator_function(*args, **kwargs)
@deprecated('`field_plain_validator_function` is deprecated, use `with_info_plain_validator_function` instead.')
def field_plain_validator_function(function: WithInfoValidatorFunction, field_name: str, **kwargs):
warnings.warn(
'`field_plain_validator_function` is deprecated, use `with_info_plain_validator_function` instead.',
DeprecationWarning,
)
return with_info_plain_validator_function(function, field_name=field_name, **kwargs)
@deprecated('`general_plain_validator_function` is deprecated, use `with_info_plain_validator_function` instead.')
def general_plain_validator_function(*args, **kwargs):
warnings.warn(
'`general_plain_validator_function` is deprecated, use `with_info_plain_validator_function` instead.',
DeprecationWarning,
)
return with_info_plain_validator_function(*args, **kwargs)
_deprecated_import_lookup = {
'FieldValidationInfo': ValidationInfo,
'FieldValidatorFunction': WithInfoValidatorFunction,
'GeneralValidatorFunction': WithInfoValidatorFunction,
'FieldWrapValidatorFunction': WithInfoWrapValidatorFunction,
}
if TYPE_CHECKING:
FieldValidationInfo = ValidationInfo
def __getattr__(attr_name: str) -> object:
new_attr = _deprecated_import_lookup.get(attr_name)
if new_attr is None:
raise AttributeError(f"module 'pydantic_core' has no attribute '{attr_name}'")
else:
import warnings
msg = f'`{attr_name}` is deprecated, use `{new_attr.__name__}` instead.'
warnings.warn(msg, DeprecationWarning, stacklevel=1)
return new_attr