1 if the object o provides numeric protocols, and
false otherwise.
This function always succeeds.
< o2".
> o2".
<= o2".
>= o2".
*p1 and
*p2 have the same type, increment their reference count
and return 0 (success). If the objects can be converted to a
common numeric type, replace *p1 and *p2 by their
converted value (with 'new' reference counts), and return 0.
If no conversion is possible, or if some other error occurs, return
-1 (failure) and don't increment the reference counts. The
call PyNumber_Coerce(&o1, &o2) is equivalent to the Python
statement "o1, o2 = coerce(o1, o2)".
See About this document... for information on suggesting changes.