def _syscall(self, command, input=None, env=None, *params):
        '''
        Call an external system command.
        '''
        return Popen([command] + list(params), stdout=PIPE, stdin=PIPE, stderr=STDOUT,
                     env=env or os.environ).communicate(input=input)
def _syscall ( self , command , input = None , env = None , * params ) : return Popen ( [ command ] + list ( params ) , stdout = PIPE , stdin = PIPE , stderr = STDOUT , env = env or os . environ ) . communicate ( input = input )
Call an external system command.