title: How to run docker tag using docker-py
body: <p>On the command line, you can run <code>docker tag [from] [to]</code> to give an image another name. The <a href="http://docker-py.readthedocs.io/en/stable/images.html" rel="nofollow noreferrer">documentation</a> does not provide any information on how to do this programmatically.</p>
  
  <p>How do you use docker-py to do a docker tag operation?</p>