Type ABCMeta

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()).

Instance Methods

check if an object is an instance __instancecheck__(cls, instance) Override for isinstance(instance, cls).

check if a class is a subclass __subclasscheck__(cls, subclass) Override for issubclass(subclass, cls).

_dump_registry(cls, file=None) Debug helper to print the ABC registry.

register(cls, subclass) Register a virtual subclass of an ABC.

Inherited from type: __call__, __delattr__, __eq__, __ge__, __getattribute__, __gt__, __hash__, __init__, __le__, __lt__, __ne__, __repr__, __setattr__, __subclasses__, mro

Inherited from object: __format__, __reduce__, __reduce_ex__, __sizeof__, __str__, __subclasshook__

Static Methods

a new object with type S, a subtype of T __new__(mcls, name, bases, namespace)

Class Variables

_abc_invalidation_counter = 18

Properties

Inherited from type: __abstractmethods__, __base__, __bases__, __basicsize__, __dictoffset__, __flags__, __itemsize__, __mro__, __name__, __weakrefoffset__

Inherited from object: __class__

Method Details

__instancecheck__(cls, instance)

Override for isinstance(instance, cls).

Returns: check if an object is an instance

Overrides: type.__instancecheck__

__new__(mcls, name, bases, namespace) Static Method

Returns: a new object with type S, a subtype of T

Overrides: object.__new__

(inherited documentation)

__subclasscheck__(cls, subclass)

Override for issubclass(subclass, cls).

Returns: check if a class is a subclass

Overrides: type.__subclasscheck__