[issue37751] In codecs, function 'normalizestring' should convert both spaces and hyphens to underscores.

[Jordon.X]

Jordon.X <9651234 at qq.com> added the comment:

Thanks vstinner. I also don't think it's necessary to backport to the old version. Close this issue is fine.

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<https://bugs.python.org/issue37751>
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