title: python dictionary: How to get all keys with specific values
body: <p>Is it possible to get all keys in a dictionary with values above a threshold?</p>
  
  <p>a dicitonary could look like:</p>
  
  <pre><code>mydict = {(0,1,2):"16",(2,3,4):"19"}
  </code></pre>
  
  <p>The Threshold could be 17 for example</p>