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

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

I think it is too late. Python 3.9 has been released already.  Reverting the change is also breaking change.

PEP 100 says:
"Search functions are expected to take one argument, the encoding name in all lower case letters and with hyphens and spaces converted to underscores"
https://www.python.org/dev/peps/pep-0100/#codecs-coder-decoders-lookup

But codecs.register() says:
"Search functions are expected to take one argument, being the encoding name in all lower case letters".

I don't know historical reason why two document are inconsistent.
https://docs.python.org/3/library/codecs.html#codecs.register

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nosy: +methane

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