Python程序员的进化

以前本站发布过一篇《 程序员的进化 》，以一种幽默的代码展现方式调侃了程序。下面这篇是关于Python程序员的。以阶乘为例，很有意思。

新手程序员

				def factorial(x):
				    if x == 0:
				        return 1
				    else:
				        return x * factorial(x - 1)
				print factorial(6)
			

第一年的刚学完Pascal的新手

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

第一年的刚学完C语言的新手

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

第一年刚学完SICP的新手

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

第一年刚学完Python的新手

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

爱偷懒的程序员

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

更懒的 Python 程序员

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

Python 专家

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

Python 黑客

				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')
			

专家级程序员

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

英语系的专家级程序员

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

Web 设计者

				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 程序员

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

Windows 程序员

				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)
			

公司里的程序员

				def new(cls, *args, **kwargs):
				    return cls(*args, **kwargs)
				class Number(object):
				    pass
				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):
				        Abstract
				    @classmethod
				    def getInstance(cls, ibase):
				        try:
				            cls.__instance
				        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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