votes up 1

issubclass() arg 1 must be a class

github stars 41445
Exception Class:

Raise code

                # we should do the magic only if second `issubclass` argument
                # is the deprecated class itself - subclasses of the
                # deprecated class should not use custom `__subclasscheck__`
                # method.
                return super().__subclasscheck__(sub)

            if not inspect.isclass(sub):
                raise TypeError("issubclass() arg 1 must be a class")

            mro = getattr(sub, '__mro__', ())
            return any(c in {cls, new_class} for c in mro)

        def __call__(cls, *args, **kwargs):
            old = DeprecatedClass.deprecated_class
            if cls is old:
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