C API: how to replace python number object in place?

[Hrvoje Niksic]

vavasis at cpu111.math.uwaterloo.ca (Stephen Vavasis) writes:

> If x is a C variable of type PyObject*, and I happen to know already
> that the object is of a numeric type, say int, is there a way to
> change the value of x in place to a different number?  In the C/API
> documentation I found routines to increment or decrement it in
> place, but I didn't find a routine to simply replace its value by a
> different value.

The only thing you can do is change x to point to a different object,
with the new desired value.  That is how the "in place" number
modification functions work.

Which routines to increment or decrement the number are you referring
to, exactly?