What about adding the walrus operator := ?

[cclauss]

Description

The walrus operator can be quite helpful but it is not yet widely adopted. All the walrus-related packages on PyPI are either unrelated to := or they actively discourage its use like https://pypi.org/project/flake8-walrus

It would be cool to have a way to automatically spot places where := could be used to accelerate its adoption.

[adamchainz]

I'd be happy to consider concrete proposals where using the walrus would lead to a comprehension/generator expression being faster. Do you have any?

[joaoe]

This seems more of a suggestion for flake8-simplify https://pypi.org/project/flake8-simplify/