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Created November 21, 2010 20:13
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Evolution of a Python programmer
#Newbie programmer
def factorial(x):
if x == 0:
return 1
return x * factorial(x - 1)
print factorial(6)
#First year programmer, studied Pascal
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
def fact(x): #{
result = i = 1;
while (i <= x): #{
result *= i;
i += 1;
return result;
#First year programmer, SICP
def fact(x, acc=1):
if (x > 1): return (fact((x - 1), (acc * x)))
else: return acc
#First year programmer, Python
def Factorial(x):
res = 1
for i in xrange(2, x + 1):
res *= i
return res
print Factorial(6)
#Lazy Python programmer
def fact(x):
return x > 1 and x * fact(x - 1) or 1
print fact(6)
#Lazier Python programmer
f = lambda x: x and x * f(x - 1) or 1
print f(6)
#Python expert programmer
import operator as op
import functools as f
fact = lambda x: f.reduce(op.mul, xrange(2, x + 1), 1)
print fact(6)
#Python hacker
import sys
def fact(x, acc=1):
if x: return fact(x.__sub__(1), acc.__mul__(x))
return acc
sys.stdout.write(str(fact(6)) + '\n')
import c_math
fact = c_math.fact
print fact(6)
import c_maths
fact = c_maths.fact
print fact(6)
#Web designer
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
import os
def fact(x):
os.system('factorial ' + str(x))
#Windows programmer
NULL = None
def CalculateAndPrintFactorialEx(dwNumber,
if lpsscSecurity != NULL:
return NULL #Not implemented
dwResult = dwCounter = 1
while dwCounter <= dwNumber:
dwResult *= dwCounter
dwCounter += 1
return 1
import sys
CalculateAndPrintFactorialEx(6, sys.stdout, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
#Enterprise programmer
def new(cls, *args, **kwargs):
return cls(*args, **kwargs)
class Number(object):
class IntegralNumber(int, Number):
def toInt(self):
return new (int, self)
class InternalBase(object):
def __init__(self, base):
self.base = base.toInt()
def getBase(self):
return new (IntegralNumber, self.base)
class MathematicsSystem(object):
def __init__(self, ibase):
def getInstance(cls, ibase):
except AttributeError:
cls.__instance = new (cls, ibase)
return cls.__instance
class StandardMathematicsSystem(MathematicsSystem):
def __init__(self, ibase):
if ibase.getBase() != new (IntegralNumber, 2):
raise NotImplementedError
self.base = ibase.getBase()
def calculateFactorial(self, target):
result = new (IntegralNumber, 1)
i = new (IntegralNumber, 2)
while i <= target:
result = result * i
i = i + new (IntegralNumber, 1)
return result
print StandardMathematicsSystem.getInstance(new (InternalBase, new (IntegralNumber, 2))).calculateFactorial(new (IntegralNumber, 6))
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uhop commented Nov 21, 2010

I updated "#Python expert programmer" to use standard library "functools" instead of third-party "functional" --- an expert programmer doesn't bother with third-party stuff, if the standard library provides exactly the tools he needs.

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