[Baypiggies] keeping cpy extension docs in sync with the native implementation

[Brian Harring]

Curious, how do y'all manage to keep your docstrings for extension 
in sync with your native implementation?  Specifically, say 
you've got 'module.submodule.some_class' , which will be 
'module._cpython_extension.kls' if the extensions are enabled, and 
'module.submodule.native_implementation' if not, how do you keep your 
literal __doc__ in sync?

This pattern is semi common if you're not requiring extensions, but 
want to use the extension if it's available (for speed reasons)- a 
real world example would be
http://www.pkgcore.org/trac/pkgcore/browser/ferringb/snakeoil-sphinx/snakeoil/caching.py

So the question is, how do y'all keep the docstrings in sync?  
Personally I'd rather not be stuck trying to keep the docstrings in 
two places perfectly in sync, but I'm not aware of anything better.

Thoughts/suggestions?
~brian
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