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i�f- � @ s( d dl mZ dd� ZG dd� de�ZdS )� )�WeakSetc C s t jS )z�Returns the current ABC cache token.
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current version of the ABC cache for virtual subclasses. The token changes
with every call to ``register()`` on any ABC.
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dd� Z� ZS )r ah 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()).
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