parameters: (command, stderr=None, stdout=None)
docstring: Raises an error when a command fails.
docstring_summary: Raises an error when a command fails.
docstring_tokens: Raises an error when a command fails .
function: def executeCommand(command, stderr=None, stdout=None):
      """ Raises an error when a command fails. """
      print("$ {}".format(command))
      subprocess.check_call(command, stderr=stderr,
                            stdout=stdout, env=dict(os.environ), shell=True)
function_tokens: def executeCommand ( command , stderr = None , stdout = None ) : print ( "$ {}" . format ( command ) ) subprocess . check_call ( command , stderr = stderr , stdout = stdout , env = dict ( os . environ ) , shell = True )