[issue40437] add string.snake function

[jeffolsi10]

jeffolsi10 <yirage2897 at coalamails.com> added the comment:

snake case has very specific definition :
https://en.wikipedia.org/wiki/Snake_case
I expect the function to implement the definition and not something that I or someone else desire.

As for your question about '$' char I could ask the same thing for lower()
The snake case convert only letters and space. It doesn't handle spacial chars. it ignores them.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40437>
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