How to make a C extension module backwards compatible?

Andrew McNamara andrewm at
Tue Sep 17 23:24:36 EDT 2002

Is there any community wisdom on how to make a C extension module that
implements a new-style class (type?) backwards compatible (albeit,
at the cost of some functionality)?

Put another way, how *should* I make a class implemented in C behave
like a new-style class when installed with python 2.2 and above, and
like an old style class when installed with older pythons?

Should I just riddle the code with #ifdef's, or is there a more elegant

Andrew McNamara, Senior Developer, Object Craft

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