title: ImportError: No module named spwd
body: <p>Could someone help, please? I can't understand why I see this.</p>
  
  <p>I'm trying to use <code>spwd</code> module from Python. I just imported it, but see this, absolutely unexpected, error when running:</p>
  
  <pre><code>Traceback (most recent call last):
  File "./library/system_users.py", line 25, in &lt;module&gt;
  import spwd
  ImportError: No module named pwd
  </code></pre>
  
  <p>I thought it should be available by default.</p>
  
  <p>Python 2.7.10<br>
  pip 8.1.1 from /Library/Python/2.7/site-packages (python 2.7)<br>
  OS X El Capitan 10.11.4</p>
  
  <p>I know sometimes <code>pip install --upgrade pip</code> can help. Unfortunately, not now.</p>
  
  <p>Thank you for the advance.</p>