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dS )z3Abstract Base Classes (ABCs) according to PEP 3119. )WeakSetc C s
d| _ | S )a A decorator indicating abstract methods.
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class that has a metaclass derived from ABCMeta cannot be
instantiated unless all of its abstract methods are overridden.
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class C(metaclass=ABCMeta):
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T)__isabstractmethod__)funcobj r /usr/lib64/python3.6/abc.pyabstractmethod s r c s$ e Zd ZdZdZ fddZ ZS )abstractclassmethodaO
A decorator indicating abstract classmethods.
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class C(metaclass=ABCMeta):
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'abstractclassmethod' is deprecated. Use 'classmethod' with
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r r s r c s$ e Zd ZdZdZ fddZ ZS )abstractstaticmethodaO
A decorator indicating abstract staticmethods.
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r r 5 s r c @ s e Zd ZdZdZdS )abstractpropertyak
A decorator indicating abstract properties.
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'super' call mechanisms.
Usage:
class C(metaclass=ABCMeta):
@abstractproperty
def my_abstract_property(self):
...
This defines a read-only property; you can also define a read-write
abstract property using the 'long' form of property declaration:
class C(metaclass=ABCMeta):
def getx(self): ...
def setx(self, value): ...
x = abstractproperty(getx, setx)
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instead.
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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
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zABCMeta.__new__c C sP t |tstdt|| r |S t| |r2td| jj| t jd7 _|S )zsRegister a virtual subclass of an ABC.
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zABCMeta._dump_registryc sb |j }| jkrdS t|}||krH jtjkr>| jkr>dS j|S t fdd||hD S )z'Override for isinstance(instance, cls).TFc 3 s | ]} j |V qd S )N)__subclasscheck__)r c)r* r r s z,ABCMeta.__instancecheck__..) r
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r c @ s e Zd ZdZdS )ABCzVHelper class that provides a standard way to create an ABC using
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