title: 465.Python程序员的进化 outline: deep

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。

目录

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))

摘自：来源