title: Get error when try to install PIL
body: <p>I try to install PIL but get errors, what should I do?</p>
  
  <pre><code>$ Command
  Result
  ------------
  $ pip install PIL
  
  Collecting PIL
    Could not find a version that satisfies the requirement PIL (from versions: )
  No matching distribution found for PIL
  --------------------------------------------------------------------
  $ pip install PIL  --allow-unverified PIL --allow-all-external
  
  DEPRECATION: --allow-all-external has been deprecated and will be removed in the future. Due to changes in the repository protocol, it no longer has any effect.
  DEPRECATION: --allow-unverified has been deprecated and will be removed in the future. Due to changes in the repository protocol, it no longer has any effect.
  Collecting PIL
    Could not find a version that satisfies the requirement PIL (from versions: )
  No matching distribution found for PIL
  </code></pre>