pure python data compression (zip)

[Rene Maurer]

Hallo

I wonder if there are any pure python implementations available/known
for the zip (or any other) data compression... As far as I know
python's zlib uses http://www.zlib.net/, which is written in
C. Unfortunately this is not solution for me, because my target "only"
has a python interpreter....

I have "googled" for a while, but I don't have found anything useful.

Regards,
René