title: Call Sentinel failover from Python
body: <p>I have a simple Redis configuration running with 3 Servers and 3 Sentinels (different instances though). This configuration is running almost flawlessly, eventually, my Master fails (common Redis problem where it couldn't finish background saving).</p>
  
  <p>My problem is when that happens whenever I try to save (or delete) something, I get the error: </p>
  
  <pre><code>ResponseError: MISCONF Redis is configured to save RDB snapshots, but
  is currently not able to persist on disk. Commands that may modify the
  data set are disabled. Please check Redis logs for details about the error.
  </code></pre>
  
  <p>Is there any way for me to ask Sentinel to call "failover" force electing a new master? By redis-cli is quite easy, but I couldn't find a way of doing it from my Python(2.7) program (using redis.py).</p>
  
  <p>Any ideas?</p>