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24 lines
907 B
Python
24 lines
907 B
Python
is_init_subclass_available = hasattr(object, "__init_subclass__")
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if not is_init_subclass_available:
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class InitSubclassMeta(type):
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"""Metaclass that implements PEP 487 protocol"""
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def __new__(cls, name, bases, ns, **kwargs):
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__init_subclass__ = ns.pop("__init_subclass__", None)
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if __init_subclass__:
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__init_subclass__ = classmethod(__init_subclass__)
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ns["__init_subclass__"] = __init_subclass__
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return super(InitSubclassMeta, cls).__new__(cls, name, bases, ns, **kwargs)
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def __init__(cls, name, bases, ns, **kwargs):
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super(InitSubclassMeta, cls).__init__(name, bases, ns)
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super_class = super(cls, cls)
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if hasattr(super_class, "__init_subclass__"):
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super_class.__init_subclass__.__func__(cls, **kwargs)
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else:
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InitSubclassMeta = type # type: ignore
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