please i need explanation

Karim kliateni at gmail.com
Fri Jan 11 11:41:42 CET 2013


On 11/01/2013 17:33, kwakukwatiah at gmail.com wrote:
>
>
> -----Original Message----- From: K. Elo
> Sent: Friday, January 11, 2013 3:56 AM
> To: python-list at python.org
> Subject: Re: please i need explanation
>
> Hi!
>
> Since there is no stated question, I need to guess:
>
> n -= 1 (instead of "f -= 1")
>
> should work.
>
> Or maybe the question was a totally different one...
>
> -Kimmo
>
> 11.01.2013 17:35, kwakukwatiah at gmail.com wrote:
>> def factorial(n):
>> if n<2:
>> return 1
>> f = 1
>> while n>= 2:
>> f *= n
>> f -= 1
>> return f
>>
>>
>>
> please it works.but don’t get why the return 1 and the code below.
>
factorial or n! = n*(n-1)*(n-2).... for n > 1. For n = 0, 1 the 
factorial is 1 the reason for the 'return 1'.

f *= n <=> f = f* n
f -= 1 <=> f = f - 1 but sure this is not correct as Kimmo said n = n - 
1 or n -= 1

Regards
Karim



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