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
第一年的刚学完Pascal的新手
第一年的刚学完C语言的新手
第一年刚学完SICP的新手
第一年刚学完Python的新手
爱偷懒的程序员
更懒的 Python 程序员
Python 专家Python 黑客
专家级程序员
英语系的专家级程序员
Web 设计者
Unix 程序员
Windows 程序员
公司里的程序员

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

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合速度

Python程序员的进化