title: get Key by value, dict, python
body: <p>How can I get a key from a value? </p>
  
  <p>my dict: </p>
  
  <pre><code>countries = {
          "Normal UK project" : "1",
          "UK Omnibus project" : "1-Omni",
          "Nordic project" : ["11","12","13","14"],
          "German project" : "21",
          "French project" : "31"
          }
  </code></pre>
  
  <p>my semi functioning code:</p>
  
  <pre><code>for k, v in countries.items():
      if "1" in v:
          print k
  </code></pre>
  
  <p>expected output:</p>
  
  <pre><code>Normal UK project
  </code></pre>
  
  <p>actual output: </p>
  
  <pre><code>French project
  UK Omnibus project
  German project
  Normal UK project
  </code></pre>
  
  <p>How can I fix my code? </p>