title: What python syntax is this?
body: <p>I understand that I created a np.poly1d object. But what does it mean by putting it back inside np.poly1d() again?</p>
  <pre><code>import numpy as np
  f = np.poly1d([1, 1, 1])
  print(np.poly1d(f))
  </code></pre>
  <p>FYI running this script, I got</p>
  <pre><code>   2
  1 x + 1 x + 1
  </code></pre>