~/tmp $ python
Python 2.6.2 (release26-maint, Apr 19 2009, 01:58:18)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import urllib
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "urllib.py", line 2, in <module>
    response = urllib.urlopen('http://python.org/')
AttributeError: 'module' object has no attribute 'urlopen'
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/apport_python_hook.py", line 38, in apport_excepthook
    from apport.packaging_impl import impl as packaging
  File "/usr/lib/python2.6/dist-packages/apport/__init__.py", line 1, in <module>
    from apport.report import Report
  File "/usr/lib/python2.6/dist-packages/apport/report.py", line 14, in <module>
    import subprocess, tempfile, os.path, urllib, re, pwd, grp, os, sys
  File "urllib.py", line 2, in <module>
    response = urllib.urlopen('http://python.org/')
AttributeError: 'module' object has no attribute 'urlopen'

Original exception was:
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "urllib.py", line 2, in <module>
    response = urllib.urlopen('http://python.org/')
AttributeError: 'module' object has no attribute 'urlopen'
>>>