title: How to return key if a given string matches the keys value in a dictionary
body: <p>I am new to dictionaries, and i'm trying to find out how to return a key if a given string matches the keys value in a dictionary.</p>
  
  <p>Example:</p>
  
  <pre><code>dict = {"color": (red, blue, green), "someothercolor": (orange, blue, white)}
  </code></pre>
  
  <p>I want to return <code>color</code> and <code>someothercolor</code>, if the key's value contains <code>blue</code>.</p>
  
  <p>Any suggestions? </p>