abc :: ABCMeta :: Class ABCMeta

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

[hide private]

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.

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

[hide private]

a new object with type S, a subtype of T

__new__(mcls, name, bases, namespace)

Class Variables

[hide private]

_abc_invalidation_counter = 10

Properties

[hide private]

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

Inherited from object: __class__

Method Details

[hide private]

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__

Type ABCMeta

__instancecheck__(cls, instance)

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

__subclasscheck__(cls, subclass)

instancecheck(cls, instance)

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

subclasscheck(cls, subclass)