code: def feed_interval_get(feed_id, parameters):
  	'Get adaptive interval between checks for a feed.'
  	val = cache.get(getkey( T_INTERVAL,
  		key=feed_interval_key(feed_id, parameters) ))
  	return val if isinstance(val, tuple) else (val, Nonef feed_interval_get(feed_id, parameters):
  	'Get adaptive interval between checks for a feed.'
  	val = cache.get(getkey( T_INTERVAL,
  		key=feed_interval_key(feed_id, parameters) ))
  	return val if isinstance(val, tuple) else (val, None)
docs: Get adaptive interval between checks for a feed.