一个Python程序员的进化
http://developer.51cto.com/art/201102/244479.htmhttp://www.pythonclub.org/hacks/evolution
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。
编程新手
[*]def factorial(x):
[*] if x == 0:
[*] return 1
[*] else:
[*] return x * factorial(x - 1)
[*]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
[*]print f(6)
Python 专家
[*]fact = lambda x: reduce(int.__mul__, xrange(2, x + 1), 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
[*]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)
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))
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