Multiple inheritance and a broken super() chain

[Alan Gauld]

On 05/07/2023 01:27, Chris Angelico via Python-list wrote:

>> So I'm curious about how big this "big problem with MI" is in
> 
> Who said it's a big problem with MI? 

I think it's a very common perception, particularly with
newer programmers who have never used it in anger. Any
time anyone discusses MI it seems somebody will jump in
and warn about diamonds etc. As a result many steer clear
of MI, which is a shame.

My personal experience of MI is that used appropriately
it is a powerful and useful tool. But it must be used
in a true is-a type relationship and not just as a kind
of cheap reuse mechanism - that's when problems start.

Also, mixin style MI is particularly powerful but the
protocol between mixin and "subclass" needs to be carefully
designed and documented. Like any powerful tool you need
to understand the costs of use as well as the potential
benefits.

-- 
Alan G
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