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From: Joshua Landau <joshua@landau.ws>
Date: Sat, 26 Oct 2013 16:32:10 +0100
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Subject: Re: Obfuscated factorial
To: "Steven D'Aprano" <steve+comp.lang.python@pearwood.info>
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Xref: csiph.com comp.lang.python:57620

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, -=E2=B5=98. You just have t=
o import it.

# Import statement
=E2=B5=98 =3D 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)+77=
1.32342877765313/(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>=3D0.5 else 3.141592653589793/(__import__("math").sin(3.141592653589793*z=
)*f(f,1-z)),n)})()

assert 2-=E2=B5=98 =3D=3D 2

assert 3-=E2=B5=98 =3D=3D 6

assert 4-=E2=B5=98 =3D=3D 24