title: can't find the command ’celery‘
body: <p>I follow the steps on this website <a href="http://docs.celeryproject.org/en/master/getting-started/first-steps-with-celery.html#first-steps" rel="nofollow noreferrer">celery docs</a> to learn celery.</p>
  
  <p>When I run the command 'pip3 install celery' and install the celery successfully. 
  <a href="https://i.stack.imgur.com/SD7Lv.png" rel="nofollow noreferrer">picture link</a></p>
  
  <p>But when I run the command 'celery worker --help',the return is can't find the command ’celery‘. Anyone can tell me why? Thank you</p>