不久前，在互联网上出现了一篇有趣的文章，讲的是对于同一个问题，不同层次的Python程序员编出的Python代码，显示出了不同的风格，代码都很简单，有趣。下面让我们一起来看看一个Python程序猿进阶的全过程吧。(偷笑)

编程新手

def factorial(x): if x == 0: return 1 else: return x * factorial(x - 1) //不简单啊，迭代，新手哦。 print factorial(6)

一年编程经验(学Pascal的)

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

一年编程经验(学C的)

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

一年编程经验(读过SICP)

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

一年编程经验(Python)

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

懒惰的Python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 //匿名函数，厉害。程序猿真是懒人做的！ print f(6)

Python专家

fact = lambda x: reduce(int.__mul__, xrange(2, x + 1), 1) print fact(6) //专家厉害啊。

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') //一般人压根看不懂。

专家级程序员

from c_math import fact print fact(6)

大英帝国程序员

from c_maths import fact print fact(6) Web设计人员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) //可能自己都晕菜了...

企业级程序员

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)) //面向对象，但就此题来说，又长又臭。