<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def is_running(self):
 """ returns True if the container is running :return: bool """

        try:
            return graceful_get(self.inspect(refresh=True), "State", "Running")
        except subprocess.CalledProcessError:
            return False