Python code written in 1998, how to improve/change it?

[Wolfgang Keller]

> what makes you think that resuming a generator won't involve function
> calls ?

That was not what I wrote.

I referred to what Peter Hansen <peter at engcorp.com> wrote in 
mailman.821.1137730663.27775.python-list at python.org:

> I believe the more modern approach to this is to use generators in some 
> way, yield each other as the next state.  This way you avoid all almost 
> all the function call overhead (the part that takes significant time, 
> which is setting up the stack frame)

The way I understand this, resuming a generator causes less overhead than the 
inital overhead of a function call.

Again, I'm just a poor scripting dilettant who's asking questions.

Sincerely,

Wolfgang Keller