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<> wrote in message
> I'm doing an analysis of program code performance when written in python
> as oppose to other programming languages, and can't seem to figure out
> why
> is the call of functions so slow?

Partly because function parameter definitions and function calls are so
flexible. For instance: named parameters, default values, and *seq and
**dic parameters.

> Is a context being created and stored on stog each time

I do not know whether stog is a type or new word for me. However, I
believe that at present all function calls other than a generator.next
call-after-first-yield do set up a new stack frame. (There has been some
discussion of some reuse in other situations also.)

> How EXACTLY does it work?

The reference manual defines that sematics that any implementation must
implement. 'Exactly' how any particular implemention fulfills that
contract is in the sources.

Terry J. Reedy