This patch includes 3 changes to unittest.py.

* Don't import unittest.(important)
  unittest is imported in the original script.
  This can be the cause of trouble.

* cast float (trivial)
  TextTestRunner.run() method has the line as 
follows:
  timeTaken = float(stopTime - startTime)

  However, time.time() returns the time by a 
floating point number by default.
  So you don't need to cast the value to a float.

* fix typo (trivial)
  """Note that decimal places (from zero) is 
usually ..."""

  'is' should be 'are'.

Logged In: YES 
user_id=21477

Thanks George! 
 
At some point in the distant past I believe it was necessary to import 
'unittest', otherwise the 'TestCase' that a module saw was not the same 
as the 'TestCase' seen within 'unittest', and the user's TestCase 
subclasses were not recognised as subclasses of the TestCase seen 
within unittest. I see no evidence that this is the case now, so I'm 
incorporating this and your other 2 changes.