title: "google-oauthlib-tool: command not found" when trying to install google assistant on raspbian
body: <p>I'm trying to install google assistant on a newly set up pi 3 with Raspbian. I got the message "No module named googlesamples.assistant.auth_helpers" so I followed the instructions given in answer to this question: <a href="https://stackoverflow.com/questions/45779671/no-module-named-googlesamples-assistant-auth-helpers">No module named googlesamples.assistant.auth_helpers</a></p>
  
  <p>The first 2 commands appear to complete OK, but the third command gives 
  "google-oauthlib-tool: command not found"</p>
  
  <p>My programming skills are too rusty to work out what's going wrong. </p>
  
  <p>Python 3.5.3;  forgotten how to find the version of SDK, but should be the latest one.</p>
  
  <p>Any help greatly appreciated.</p>