title: Importing PNG files into Numpy?
body: <p>I have about 200 grayscale PNG images stored within a directory like this.</p>
  
  <pre><code>1.png
  2.png
  3.png
  ...
  ...
  200.png
  </code></pre>
  
  <p>I want to import all the PNG images as NumPy arrays.
  How can I do this?</p>