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Python factorial handbook

January 10th, 2010 Fu4ny Leave a comment Go to comments

Here is a small code-snippet I found and collected.

It takes extract 1 argument and return its factiorial ( n! )


#Newbie programmer

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def factorial(x):
    if x == 0:
        return 1
    else:
        return x * factorial(x - 1)

#First year programmer, studied Pascal 

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def factorial(x):
result = 1
i = 2
while i < = x:
result = result * i
i = i + 1
return result
print factorial(6)

#First year programmer, studied C 

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def fact(x): #{
result = i = 1;
while (i < = x): #{
result *= i;
i += 1;
#}
return result;
#}
print(fact(6))

#First year programmer, SICP 

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@tailcall
def fact(x, acc=1):
if (x > 1): return (fact((x - 1), (acc * x)))
else: return acc
print(fact(6))

#First year programmer, Python 

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def Factorial(x):
res = 1
for i in xrange(2, x + 1):
res *= i
return res
print Factorial(6)

#Lazy Python programmer 

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def fact(x):
return x > 1 and x * fact(x - 1) or 1
print fact(6)

#Lazier Python programmer 

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f = lambda x: x and x * f(x - 1) or 1
print f(6)

#Python expert programmer

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import operator as op
import functional as f
fact = lambda x: f.foldl(op.mul, 1, xrange(2, x + 1))
print fact(6)

#Python hacker

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import sys
@tailcall
def fact(x, acc=1):
if x: return fact(x.__sub__(1), acc.__mul__(x))
return acc
sys.stdout.write(str(fact(6)) + '\n')

#EXPERT PROGRAMMER 

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import c_math
fact = c_math.fact
print fact(6)

#ENGLISH EXPERT PROGRAMMER 

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import c_maths
fact = c_maths.fact
print fact(6)

#Web designer 

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def factorial(x):
#-------------------------------------------------
#--- Code snippet from The Math Vault ---
#--- Calculate factorial (C) Arthur Smith 1999 ---
#-------------------------------------------------
result = str(1)
i = 1 #Thanks Adam
while i < = x:
#result = result * i #It's faster to use *=
#result = str(result * result + i)
#result = int(result *= i) #??????
result str(int(result) * i)
#result = int(str(result) * i)
i = i + 1
return result
print factorial(6)

#Unix programmer 

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import os
def fact(x):
os.system('factorial ' + str(x))
fact(6)

#Windows programmer 

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NULL = None
def CalculateAndPrintFactorialEx(dwNumber,
hOutputDevice,
lpLparam,
lpWparam,
lpsscSecurity,
*dwReserved):
if lpsscSecurity != NULL:
return NULL #Not implemented
dwResult = dwCounter = 1
while dwCounter < = dwNumber:
dwResult *= dwCounter
dwCounter += 1
hOutputDevice.write(str(dwResult))
hOutputDevice.write('\n')
return 1
import sys
CalculateAndPrintFactorialEx(6, sys.stdout, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
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