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dS(s3Abstract Base Classes (ABCs) according to PEP 3119.i����N(tWeakSett_CcBseZRS((t__name__t
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t|_|S(s�A decorator indicating abstract methods.

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    class that has a metaclass derived from ABCMeta cannot be
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    Usage:

        class C:
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            @abstractproperty
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                ...

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    ABCs as 'virtual subclasses' -- these and their descendants will
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