SystemError: com_backpatch: offset too large

[alban.minassian at wanadoo.fr]

(Sorry for my bad english )

I convert a php code to python. i have 10000 lines where i add and add
and add string.... like var += "xxxxxx"

And line 5139 i have SystemError: com_backpatch: offset too large.
All work except if i exceed line 5139 !

I dont find solution. I have only found this post
http://groups.google.com/groups?hl=fr&lr=&client=firefox-a&threadm=mailman.165.1085189105.6949.python-list%40python.org&rnum=1&prev=/groups%3Fq%3Dcom_backpatch%26hl%3Dfr%26lr%3D%26client%3Dfirefox-a%26sa%3DN%26tab%3Dwg

There is a solution?
Do i to give up python and return to php?

Thank for your help
Alban