KeyError: 'getpwuid(): uid not found: 5001'

[cancan101]

I am trying to use matplotlib inside a Docker container running as non root. When I do I get the following:

$ docker run -u 5001  -it  4catalyzer/ipython python -c 'import matplotlib'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/__init__.py", line 1131, in <module>
    rcParams = rc_params()
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/__init__.py", line 965, in rc_params
    fname = matplotlib_fname()
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/__init__.py", line 794, in matplotlib_fname
    configdir = _get_configdir()
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/__init__.py", line 649, in _get_configdir
    return _get_config_or_cache_dir(_get_xdg_config_dir())
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/__init__.py", line 626, in _get_config_or_cache_dir
    return _create_tmp_config_dir()
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/__init__.py", line 555, in _create_tmp_config_dir
    tempdir = os.path.join(tempdir, 'matplotlib-%s' % getpass.getuser())
  File "/usr/lib/python2.7/getpass.py", line 158, in getuser
    return pwd.getpwuid(os.getuid())[0]
KeyError: 'getpwuid(): uid not found: 5001'

Potentially just have getpass.getuser() then fall back to the UID value.

[cancan101]

Something like:

try:
    username = getpass.getuser()
except KeyError:
    username = str(os.getuid())
tempdir = os.path.join(tempdir, 'matplotlib-%s' % username)

[jenshnielsen]

Looks good to me. Will you make that change in a Pull Request?