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If these changes are applied throughout the interpreter I 
expect a significant speedup but that is not my immediate 
goal. I am looking for redability, reduction of code size (both 
source and binary) and reliability (less things to check or 
forget to check).

I am trying to get rid of code like

         if (docstr == NULL) {
                docstr= PyString_InternFromString("__doc__");
                if (docstr == NULL)
                        return NULL;
 
And replace it with just PyNAME(__doc__)