documentation for PyArg_ParseTupleAndKeywords

[Steven Bethard]

I'm just starting to play around with the Python source.  (Specifically, 
I'm looking at adding a key argument to max/min like sorted has.)  Can 
anyone direct me to the documentation on how 
PyArg_ParseTupleAndKeywords, etc. work?  In particular, I can't figure 
out how the format arg to vgetargskeywords should be specified...

Thanks,
Steve
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