title: can not import the module deepcopy
body: <p>i've ran into this wierd error since few days where most of the applications/frameworks/modules will refuse to run , because of of the unavailability of the module deepcopy i can't understand why is that so ? </p>
  
  <pre><code>    Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "/usr/lib/pymodules/python2.6/django/http/__init__.py", line 13, in &lt;module&gt;
      from django.utils.datastructures import MultiValueDict, ImmutableList
    File "/usr/lib/pymodules/python2.6/django/utils/datastructures.py", line 3, in &lt;module&gt;
      from django.utils.copycompat import deepcopy
  ImportError: cannot import name deepcopy
  </code></pre>
  
  <p>why is that so ? and how it can be fixed ? </p>