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

[Jordon.X]

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

The design and code of the following four places need to be consistent,

No.1 https://github.com/python/peps/blob/master/pep-0100.txt#L292
No.2 https://github.com/python/cpython/blob/master/Python/codecs.c#L113
No.3 https://github.com/python/cpython/blob/master/Python/codecs.c#L53  
No.4 https://github.com/python/cpython/blob/master/Python/codecs.c#74

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