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Re: Obfuscated factorial

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On 26 October 2013 12:55, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> wrote:
> Just for fun:
...
> for i in range(16):
>     print(i, FactorialBuilder(i).build().calculate())

Python already supports the factorial operator, -ⵘ. You just have to import it.

# Import statement
ⵘ = type("",(),{"__rsub__":lambda s,n:(lambda f,n:f(f,n))(lambda
f,z:round((2.5066282746310002*(z+0j+7.5)**(z+0.5)*2.718281828459045**(-z-7.5)*(0.99999999999980993+676.5203681218851/(z+1)-1259.1392167224028/(z+2)+771.32342877765313/(z+3)-176.61502916214059/(z+4)+12.507343278686905/(z+5)-0.13857109526572012/(z+6)+9.9843695780195716e-6/(z+7)+1.5056327351493116e-7/(z+8))).real)if
z>=0.5 else 3.141592653589793/(__import__("math").sin(3.141592653589793*z)*f(f,1-z)),n)})()

assert 2-ⵘ == 2

assert 3-ⵘ == 6

assert 4-ⵘ == 24

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Obfuscated factorial Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-10-26 11:55 +0000
  Re: Obfuscated factorial Vito De Tullio <vito.detullio@gmail.com> - 2013-10-26 14:50 +0200
  Re: Obfuscated factorial Chris Angelico <rosuav@gmail.com> - 2013-10-27 00:26 +1100
  Re: Obfuscated factorial Joshua Landau <joshua@landau.ws> - 2013-10-26 16:32 +0100
  Re: Obfuscated factorial Tim Chase <python.list@tim.thechases.com> - 2013-10-26 10:35 -0500
  Re: Obfuscated factorial Gene Heskett <gheskett@wdtv.com> - 2013-10-26 10:13 -0400
  Re: Obfuscated factorial Vito De Tullio <vito.detullio@gmail.com> - 2013-10-27 08:28 +0100

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