On Saturday 26 October 2013 10:12:33 Steven D'Aprano did opine:
> Just for fun:
>
>
> class Numberator:
> def __init__(self, number):
> self.__number = number
> def evaluate(self):
> return self.__number
>
> class Multiplier:
> def __init__(self, multiplier, multiplicand):
> self.multiplier = multiplier
> self.multiplicand = multiplicand
> def evaluate(self):
> return self.multiplier * self.multiplicand.evaluate()
>
> class FactorialBuilder:
> def __init__(self, number):
> if not isinstance(number, int):
> raise TypeError
> if number < 0:
> raise ValueError
> self.__number = number
> def build(self):
> multiplicand = Numberator(1)
> for n in range(2, self.__number + 1):
> multiplicand = Multiplier(n, multiplicand)
> return Factorialiser(multiplicand)
>
> class Factorialiser:
> def __init__(self, evaluatorix):
> self.__evaluatorix = evaluatorix
> def calculate(self):
> return self.__evaluatorix.evaluate()
>
> for i in range(16):
> print(i, FactorialBuilder(i).build().calculate())
>
>
>
> And the output is:
>
> 0 1
> 1 1
> 2 2
> 3 6
> 4 24
> 5 120
> 6 720
> 7 5040
> 8 40320
> 9 362880
> 10 3628800
> 11 39916800
> 12 479001600
> 13 6227020800
> 14 87178291200
> 15 1307674368000
>
Nice, but will it go to 70? :)
>
> It goes without saying that this isn't Pythonic :-)
Cheers, Gene
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
"Out of register space (ugh)"
-- vi
A pen in the hand of this president is far more
dangerous than 200 million guns in the hands of
law-abiding citizens.
--
https://mail.python.org/mailman/listinfo/python-list
