Terry Reedy tjreedy at udel.edu
Thu Nov 11 13:38:07 EST 2004

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"Philippe C. Martin" <philippecmartin at sbcglobal.net> wrote in message 
news:200411111110.00909.philippecmartin at sbcglobal.net...
> 2) Is there a rule of thumb to follow when writing a c extention which 
> will
> ensure backward compatibility with earlier python versions:

The C API changes slowly but it does change.  So don't use API functions 
which have been added or which have changed since the earliest version you 
want to support.  For future compatibility, don't use functions which are 
deprecated (or which will be ;-).  I think changes are documented for each 
version, but I do not know of any master summary.  If there is not one, an 
info PEP (or web site page) on C API changes would probably be accepted 
should someone write and submit one.

Terry J. Reedy

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