def _uri(self, start_time, end_time, freq, future=False):
    'Get the uri of calendar generation task.'
    return hash_args(start_time, end_time, freq, future)
Get the uri of calendar generation task.
def _uri(self, start_time, end_time, freq, future=False):
    
    return hash_args(start_time, end_time, freq, future)