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# Copyright 2007 Google, Inc. All Rights Reserved. # Licensed to PSF under a Contributor Agreement. """Abstract Base Classes (ABCs) according to PEP 3119.""" def abstractmethod(funcobj): """A decorator indicating abstract methods. Requires that the metaclass is ABCMeta or derived from it. A class that has a metaclass derived from ABCMeta cannot be instantiated unless all of its abstract methods are overridden. The abstract methods can be called using any of the normal 'super' call mechanisms. abstractmethod() may be used to declare abstract methods for properties and descriptors. Usage: class C(metaclass=ABCMeta): @abstractmethod def my_abstract_method(self, ...): ... """ funcobj.__isabstractmethod__ = True return funcobj class abstractclassmethod(classmethod): """A decorator indicating abstract classmethods. Deprecated, use 'classmethod' with 'abstractmethod' instead. """ __isabstractmethod__ = True def __init__(self, callable): callable.__isabstractmethod__ = True super().__init__(callable) class abstractstaticmethod(staticmethod): """A decorator indicating abstract staticmethods. Deprecated, use 'staticmethod' with 'abstractmethod' instead. """ __isabstractmethod__ = True def __init__(self, callable): callable.__isabstractmethod__ = True super().__init__(callable) class abstractproperty(property): """A decorator indicating abstract properties. Deprecated, use 'property' with 'abstractmethod' instead. """ __isabstractmethod__ = True try: from _abc import (get_cache_token, _abc_init, _abc_register, _abc_instancecheck, _abc_subclasscheck, _get_dump, _reset_registry, _reset_caches) except ImportError: from _py_abc import ABCMeta, get_cache_token ABCMeta.__module__ = 'abc' else: class ABCMeta(type): """Metaclass for defining Abstract Base Classes (ABCs). Use this metaclass to create an ABC. An ABC can be subclassed directly, and then acts as a mix-in class. You can also register unrelated concrete classes (even built-in classes) and unrelated ABCs as 'virtual subclasses' -- these and their descendants will be considered subclasses of the registering ABC by the built-in issubclass() function, but the registering ABC won't show up in their MRO (Method Resolution Order) nor will method implementations defined by the registering ABC be callable (not even via super()). """ def __new__(mcls, name, bases, namespace, **kwargs): cls = super().__new__(mcls, name, bases, namespace, **kwargs) _abc_init(cls) return cls def register(cls, subclass): """Register a virtual subclass of an ABC. Returns the subclass, to allow usage as a class decorator. """ return _abc_register(cls, subclass) def __instancecheck__(cls, instance): """Override for isinstance(instance, cls).""" return _abc_instancecheck(cls, instance) def __subclasscheck__(cls, subclass): """Override for issubclass(subclass, cls).""" return _abc_subclasscheck(cls, subclass) def _dump_registry(cls, file=None): """Debug helper to print the ABC registry.""" print(f"Class: {cls.__module__}.{cls.__qualname__}", file=file) print(f"Inv. counter: {get_cache_token()}", file=file) (_abc_registry, _abc_cache, _abc_negative_cache, _abc_negative_cache_version) = _get_dump(cls) print(f"_abc_registry: {_abc_registry!r}", file=file) print(f"_abc_cache: {_abc_cache!r}", file=file) print(f"_abc_negative_cache: {_abc_negative_cache!r}", file=file) print(f"_abc_negative_cache_version: {_abc_negative_cache_version!r}", file=file) def _abc_registry_clear(cls): """Clear the registry (for debugging or testing).""" _reset_registry(cls) def _abc_caches_clear(cls): """Clear the caches (for debugging or testing).""" _reset_caches(cls) class ABC(metaclass=ABCMeta): """Helper class that provides a standard way to create an ABC using inheritance. """ __slots__ = ()