title: List of language codes (ISO639-1) in Python?
body: <p>Is it possible to get the list of all ISO639-1 language codes from pycountry 1.15? For example, ['en','it','el','fr',...]? If yes then how?</p>
  
  <p>The following doesn't work I am afraid:</p>
  
  <pre><code>import pycountry
  pycountry.languages
  </code></pre>