How to use 'python call superclass method' in Python

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def super(cls, method):
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  """Imitate super() in a mix-in.
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  This method is a substitute for
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    super(MixinClass, self).overloaded_method(arg),
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  which we can't use because mix-ins appear at the end of the MRO. It should
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  be called as
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    MixinClass.super(self.overloaded_method)(arg)
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  . It works by finding the class on which MixinMeta.__init__ set
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  MixinClass.overloaded_method and calling super() on that class.
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  Args:
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    method: The method in the mix-in.
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  Returns:
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    The method overloaded by 'method'.
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  """
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  for supercls in type(method.__self__).__mro__:
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    # Fetch from __dict__ rather than using getattr() because we only want
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    # to consider methods defined on supercls itself (not on a parent).
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    if ("__mixin_overloads__" in supercls.__dict__ and
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        supercls.__mixin_overloads__.get(method.__name__) is cls):
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      method_cls = supercls
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      break
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  return getattr(super(method_cls, method.__self__), method.__name__)