title: What do these python `import` statements mean?
body: <p>At the beginning of a python script, there are some <code>import</code> statements. Could someone explain what they imply?</p>
  
  <pre><code>import getopt  
  import os  
  import re   
  import string  
  import sys  
  import getpass  
  import urllib  
  import subprocess
  </code></pre>