def create_tree_watcher(pl, watcher_type=u'auto', expire_time=10):
 return TreeWatcher(pl, watcher_type, expire_time)

def create_tree_watcher ( pl , watcher_type = u'auto' , expire_time = 10 ) : return TreeWatcher ( pl , watcher_type , expire_time )
create an object that can watch for changes in specified directories .