[issue4963] mimetypes.guess_extension result changes after mimetypes.init()

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


----------
stage: test needed -> needs patch
versions: +Python 3.6, Python 3.7 -Python 2.7, Python 3.2, Python 3.3, Python 3.4

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4963>
_______________________________________