Self function

bearophileHUGS at lycos.com bearophileHUGS at lycos.com
Mon May 4 21:12:19 CEST 2009


Arnaud Delobelle:
> def fac(n):
>     def rec(n, acc):
>         if n <= 1:
>             return acc
>         else:
>             return rec(n - 1, n*acc)
>     return rec(n, 1)

Right, that's another way to partially solve the problem I was talking
about. (Unfortunately the performance in Python is significantly
lower. I can use that in D).


> Bearophile, there is a thread on python-ideas about tail-call
> optimization at the moment.

Someday I'll have to start following those mailing lists...
But I am not interested in such optimization. It's not going to help
me significantly. Most times I use recursion, I think it can't be
optimized away by simple means (think about a visit to a binary tree).

Bye,
bearophile



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