Getting all superclasses in Python 3

by

Use the __mro__ attribute:

>>> class A:
...     pass
...
>>> class B:
...     pass
...
>>> class C(A, B):
...     pass
...
>>> C.__mro__
(<class '__main__.C'>, <class '__main__.A'>, <class '__main__.B'>, <class 'object'>)

This is a special attribute populated at class instantiation time:

class.__mro__ This attribute is a tuple of classes that are
considered when looking for base classes during method resolution.

class.mro() This method can be overridden by a metaclass to
customize the method resolution order for its instances. It is called
at class instantiation, and its result is stored in __mro__.

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