[issue39154] "utf8" not always a synonym for "utf-8" in lib2to3

[Peter Ludemann]

Peter Ludemann <peter.ludemann at gmail.com> added the comment:

To clarify and fix a typo ... lib2to3.pgen2.tokenize.detect_encoding checks for 'utf-8'(and 'utf_8') but not 'utf8' in various places. Similarly for 'latin-1' and 'latin1'. (The codecs documentation page allows 'utf8' and 'latin1' as codecs.)

['UTF-8' is taken care of in _get_normal_name] 

See also https://bugs.python.org/issue39155

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