Multiple inheritance and a broken super() chain

[Mats Wichmann]

On 7/3/23 12:13, Mats Wichmann via Python-list wrote:

To natter on a bit, and possibly muddy the waters even further...

> Now, as I see it, from the super()'s point of view, there are two
> inheritance chains, one starting at Left and the other at Right. But
> *Right.__init__()* is called twice.
No: each class has just a single inheritance chain, built up when the 
class object is constructed, to avoid going insane. Yes, the chain for 
Left and for Right are different, but you're not instantiating *either* 
of those classes when you make a Bottom, so they don't matter here. 
You're just filling out a Bottom: it looks for init, finds it, and so 
would stop hunting - but then the super() call there sends it to the 
next class object in the chain to look for the method you told it to 
(also init), where it would stop since it found it, except you sent it 
on with another super(), and so on.  Python is a bit... different :) 
(compared to other languages with class definitions)