Aran MRO example

norepro.py

class ABC: pass 
class Widg(ABC): pass 
class Cont(Widg): pass 
class SCont(Cont): pass 
class Top(Widg): pass 
class Win(Top, SCont): pass

Win()

# >>> Top.mro()
# [<class '__main__.Top'>, <class '__main__.Widg'>, <class '__main__.ABC'>, <class 'object'>]
# 
# >>> SCont.mro()
# [<class '__main__.SCont'>, <class '__main__.Cont'>, <class '__main__.Widg'>, <class '__main__.ABC'>, <class 'object'>]
#
# >>> Win.mro()
# [<class '__main__.Win'>, <class '__main__.Top'>, <class '__main__.SCont'>, <class '__main__.Cont'>, <class '__main__.Widg'>, <class '__main__.ABC'>, <class 'object'>]