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You should report this to the pycurl project.  The specific 
error message you report is new in Python 2.3, doing a check 
for errnoneous usage of the Python C API.  That check didn't 
exist in Python 2.2.

While it's possible there's a previously unreported error in 
Python 2.3 here, it's much more likely that the problem is in 
pycurl's C code, and that the error there simply went 
undetected before Python 2.3, appearing to work by luck.