Conditional operator in Python?

[Mikael Olofsson]

On 04-Sep-2001 thp at cs.ucr.edu wrote:
 >  Terry Reedy <tjreedy at home.com> wrote:
 >  
 > : <thp at cs.ucr.edu> wrote in message news:9n1hr7$7op$1 at glue.ucr.edu...
 > :> I hate writing:
 > :>
 > :>   factorial = lambda x : (x<=1 and [1] or [x*factorial(x-1)])[0]
 >  
 > : Since 1 != 0, quite dependably, you do not need to. try "x<=1 and 1 or
 > : x*factorial(x-1)"

Interesting. If I were to write a factorial using a lambda, I would probably
have written

  factorial = lambda x: reduce(lambda a,b:a*b,range(1,x+1))

or 

  import operator
  factorial = lambda x: reduce(operator.__mul__, range(1,x+1))

Those two throw exceptions for non-positive input, which I prefer. But
regrettably, they give rather stupid error messages. 

/Mikael

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Date:    04-Sep-2001
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