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Answers
Python has a mechanism called Method Resolution Order (MRO) to find proper methods in class hierarchies. There are two rules in MRO:
1- dept-first left-to-right search
2- only the last occurrence of a class is considered
Now back to your example:
I. The search starts at D by adding it to the MRO list [D].
II. Class D is inherited from B and C. B is the left most parent and then comes C. So the MRO list becomes [D, B, C].
III. Then the search continues to a deeper level with is parent of B and A is added to the list. Now we have [D, B, C, A]. The search continues to parents of C with is again A. Since A is already in the list, nothing changes.
IV. The search goes to a deeper level (parents of A) and because A does not have any explicit parent, the search ends at this point.
So the final list is [D, B, C, A].
super() method uses this list to do its job and thats why A is called at the end
Source
License : cc by-sa 3.0
http://stackoverflow.com/questions/39423134/how-does-python-3-super-work-in-this-particular-multiple-inheritance-situation
