def _delay_call(self):
        """
            Makes sure that web service calls are at least 0.2 seconds apart.
        """
        now = time.time()

        time_since_last = now - self.last_call_time

        if time_since_last < DELAY_TIME:
            time.sleep(DELAY_TIME - time_since_last)

        self.last_call_time = now
Makes sure that web service calls are at least 0.2 seconds apart.