title: Python split dictionary key at comma
body: <p>I have a dictionary called muncounty- the keys are municipality, county. separted by a comma and the value is a zip code </p>
  
  <pre><code> muncounty['mun'+','+'county'] = 12345
  </code></pre>
  
  <p>My goal is to split the keys at the comma separating the mun and county and only extract the mun.</p>
  
  <p>I have tried </p>
  
  <pre><code>muncounty.keys().split(',')
  </code></pre>
  
  <ul>
  <li>i know this does not work because you cannot use the split function on a list</li>
  </ul>