[issue8774] tabnanny improperly handles non-ascii source files

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> You should handle the case of encoding being None.

detect_encoding() never returns None for the encoding. If there is no cookie, utf8 is returned by default.

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<http://bugs.python.org/issue8774>
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