STINNER Victor added the comment:

> See also get_standard_encoding() in Python/codecs.c. I suppose it is faster.

I understand that PyCodec_SurrogatePassErrors() is already called with a 
normalized encoding name.

With my enhanced _Py_normalize_encoding(), strange syntaxes like " utf 8 " also 
take the fast path.


> UTF-32 is rarely used as external encoding, but ...

Ok, I used the same design than get_standard_encoding() to match the "utf" 
prefix, so having a fast-path for UTF-16 and UTF-32 doesn't add new strcmp() 
for "latin9".

I pushed my change, so I close the issue.

----------
resolution:  -> fixed
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27938>
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