title: how to install PIL with pip?
body: <p>when I run the following</p>
  <pre><code>from tkinter import *
  from PIL import ImageTk, Image
  
  
  
  
  root.mainloop()
  </code></pre>
  <p>I got</p>
  <pre><code>Traceback (most recent call last):
    File &quot;image_viewer.py&quot;, line 2, in &lt;module&gt;
      from PIL import ImageTk, Image
  ImportError: No module named PIL
  </code></pre>
  <p>but I already install Pillow and everything is fine.</p>