搞笑的程序猿：看看你是哪种Python程序员

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。