Message 246649 - Python tracker

I bumped into a similar issue with mimetypes.guess_extension on Arch Linux 64-bit in February.  The behavior is still present in python 3.4.3.

$ python test.py
.htm
$ python test.py
.html
$ cat test.py
from mimetypes import guess_extension

print(guess_extension('text/html'))
$ python
Python 3.4.3 (default, Mar 25 2015, 17:13:50)
[GCC 4.9.2 20150304 (prerelease)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>