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d S)z3Abstract Base Classes (ABCs) according to PEP 3119.� )�WeakSetc C s
d | _ | S)a� A decorator indicating abstract methods.
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'super' call mechanisms.
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class C(metaclass=ABCMeta):
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A decorator indicating abstract classmethods.
Similar to abstractmethod.
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A decorator indicating abstract staticmethods.
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Usage:
class C(metaclass=ABCMeta):
@abstractproperty
def my_abstract_property(self):
...
This defines a read-only property; you can also define a read-write
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ABCs as 'virtual subclasses' -- these and their descendants will
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