Why list.sort() don't return the list reference instead of None?

[Erik Max Francis]

ankyhe at gmail.com wrote:

> L = [4,3,2,1]
> L=L.sort()
> L will refer to None, why L.sort() don't return the L?
> I want to ask why the designer of Python do so?

Because that's the convention that signifies that a Python method 
mutates the object rather than returns a new one.

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