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import sys __all__ = ['install', 'NullFinder', 'PyPy_repr', 'Protocol'] try: from typing import Protocol except ImportError: # pragma: no cover """ pytest-mypy complains here because: error: Incompatible import of "Protocol" (imported name has type "typing_extensions._SpecialForm", local name has type "typing._SpecialForm") """ from typing_extensions import Protocol # type: ignore def install(cls): """ Class decorator for installation on sys.meta_path. Adds the backport DistributionFinder to sys.meta_path and attempts to disable the finder functionality of the stdlib DistributionFinder. """ sys.meta_path.append(cls()) disable_stdlib_finder() return cls def disable_stdlib_finder(): """ Give the backport primacy for discovering path-based distributions by monkey-patching the stdlib O_O. See #91 for more background for rationale on this sketchy behavior. """ def matches(finder): return getattr( finder, '__module__', None ) == '_frozen_importlib_external' and hasattr(finder, 'find_distributions') for finder in filter(matches, sys.meta_path): # pragma: nocover del finder.find_distributions class NullFinder: """ A "Finder" (aka "MetaClassFinder") that never finds any modules, but may find distributions. """ @staticmethod def find_spec(*args, **kwargs): return None # In Python 2, the import system requires finders # to have a find_module() method, but this usage # is deprecated in Python 3 in favor of find_spec(). # For the purposes of this finder (i.e. being present # on sys.meta_path but having no other import # system functionality), the two methods are identical. find_module = find_spec class PyPy_repr: """ Override repr for EntryPoint objects on PyPy to avoid __iter__ access. Ref #97, #102. """ affected = hasattr(sys, 'pypy_version_info') def __compat_repr__(self): # pragma: nocover def make_param(name): value = getattr(self, name) return f'{name}={value!r}' params = ', '.join(map(make_param, self._fields)) return f'EntryPoint({params})' if affected: # pragma: nocover __repr__ = __compat_repr__ del affected