Extensions to six python 2 and 3 compatibility layer.
subprocess.Popen does not find the file to execute
alias of OSError
This is to be imported as a standard module.
Examples
>>> from pyhetdex.tools.six_ext import mock
>>> # or if :mod:`~pyhetdex.tools.six_ext` has already been imported somewhere
>>> # in the code
>>> from six.moves import mock