title: ImportError: No module named isodate
body: <p>I cant import rdflib in python. error detailed:</p>
  
  <pre><code>Python 2.7.3 (default, Jun 27 2012, 23:48:21) 
  [GCC 4.6.1] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import rdflib
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "/usr/local/lib/python2.7/site-packages/rdflib/__init__.py", line 65, in &lt;module&gt;
      from rdflib.term import URIRef, BNode, Literal, Variable
    File "/usr/local/lib/python2.7/site-packages/rdflib/term.py", line 49, in &lt;module&gt;
      from isodate import parse_time, parse_date, parse_datetime
  ImportError: No module named isodate
  </code></pre>
  
  <p>I would be grateful if anybody can help.</p>
  
  <p>Thanks.</p>