title: arq worker - learning : python
body: <p>let me know... how to setup worker for the arq job in python.</p>
  <p>error i got</p>
  <p><strong>assert len(self.functions) &gt; 0, 'at least one function or cron_job must be registered'
  AssertionError: at least one function or cron_job must be registered</strong></p>