def _checkReadable(self, msg=None):
        if not self.readable():
            raise IOError("File or stream is not readable."
                          if msg is None else msg)
Searches the PATH for the given command and returns its path
dataset/ETHPy150Open azoft-dev-team/imagrium/env/Lib/_pyio.py/IOBase._checkReadable--crossover with--dataset/ETHPy150Open balanced/status.balancedpayments.com/venv/lib/python2.7/site-packages/pip-1.3.1-py2.7.egg/pip/util.py/find_command