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d� de�ZG dd� ded�ZdS )z3Abstract Base Classes (ABCs) according to PEP 3119.c C s
d| _ | S )a< 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, ...):
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T)�__isabstractmethod__)Zfuncobj� r �*/usr/local/python-3.8/lib/python3.8/abc.py�abstractmethod s r c s$ e Zd ZdZdZ� fdd�Z� ZS )�abstractclassmethodztA decorator indicating abstract classmethods.
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r r s r c s$ e Zd ZdZdZ� fdd�Z� ZS )�abstractstaticmethodzvA decorator indicating abstract staticmethods.
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r r ) s r c @ s e Zd ZdZdZdS )�abstractpropertyzoA decorator indicating abstract properties.
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� Z S )r a� 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()).
c s" t � j| |||f|�}t|� |S )N)r �__new__r )Zmcls�nameZbasesZ namespace�kwargs�clsr
r r r" T s zABCMeta.__new__c C s
t | |�S )z{Register a virtual subclass of an ABC.
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)r �r% Zsubclassr r r �registerY s zABCMeta.registerc C s
t | |�S )z'Override for isinstance(instance, cls).)r )r% Zinstancer r r �__instancecheck__` s zABCMeta.__instancecheck__c C s
t | |�S )z'Override for issubclass(subclass, cls).)r r& r r r �__subclasscheck__d s zABCMeta.__subclasscheck__Nc C s� t d| j� d| j� �|d� t dt� � �|d� t| �\}}}}t d|��|d� t d|��|d� t d|��|d� t d|��|d� d S )
z'Debug helper to print the ABC registry.zClass: �.)�filezInv. counter: z_abc_registry: z _abc_cache: z_abc_negative_cache: z _abc_negative_cache_version: N)�printr r r r )r% r+ Z
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�zABCMeta._dump_registryc C s t | � dS )z.Clear the registry (for debugging or testing).N)r �r% r r r �_abc_registry_cleart s zABCMeta._abc_registry_clearc C s t | � dS )z,Clear the caches (for debugging or testing).N)r r. r r r �_abc_caches_clearx s zABCMeta._abc_caches_clear)N) r r r r r" r' r( r) r- r/ r0 r r r r
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r c @ s e Zd ZdZdZdS )�ABCzVHelper class that provides a standard way to create an ABC using
inheritance.
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