Avoiding argument checking in recursive calls

andrew cooke andrew at acooke.org
Wed Feb 11 10:58:54 CET 2009


Terry Reedy wrote:
> Reverse the test order
>
> def fact(n):
>      if n > 0: return fact(n-1)*n
>      if n == 0: return 1
>      raise ValueError

sweet!  but is this generally possible?  ie: did you think this up for
this question or is it an idiom that you find yourself using often?

andrew




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