[BioPython] Newbie question regarding GenBank in Tutorial

[rick osborne]

I am running through the BioPython tutorial and have had success with
everything until I try the GenBank example. When I do:

>>> from Bio import GenBank

I get:

Traceback (most recent call last):
  File "<interactive input>", line 1, in ?
  File "C:\Python22\Lib\site-packages\Bio\GenBank\__init__.py", line 53, in
?
    import Martel
  File "C:\Python22\Lib\site-packages\Martel\__init__.py", line 6, in ?
    import Expression
  File "C:\Python22\Lib\site-packages\Martel\Expression.py", line 31, in ?
    import Parser
  File "C:\Python22\Lib\site-packages\Martel\Parser.py", line 33, in ?
    import TextTools
ImportError: No module named TextTools
>>>

I have looked around for TextTools, to no avail. Can someone help?

Thanks.