趣文:Python程序员的进化史
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导读:下面代码来自 fmeyer ,列举了各种程序员所写的阶乘算法代码,甚至包括网页设计师的。
#新手程序员- def factorial(x):
- if x == 0:
- return 1
- else:
- return x * factorial(x - 1)
- print factorial(6)
def factorial(x): if x == 0: return 1 else: return x * factorial(x - 1)print factorial(6)
#有一年 Pascal 经验的程序员
- def factorial(x):
- result = 1
- i = 2
- while i <= x:
- result = result * i
- i = i + 1
- return result
- print factorial(6)
def factorial(x): result = 1 i = 2 while i <= x: result = result * i i = i + 1 return resultprint factorial(6)
#有一年 C 经验的程序员
- def fact(x): #{
- result = i = 1;
- while (i <= x): #{
- result *= i;
- i += 1;
- #}
- return result;
- #}
- print(fact(6))
def fact(x): #{ result = i = 1; while (i <= x): #{ result *= i; i += 1; #} return result;#}print(fact(6))
#有一年 SICP 经验的程序员
- @tailcall
- def fact(x, acc=1):
- if (x > 1): return (fact((x - 1), (acc * x)))
- else: return acc
- print(fact(6))
@tailcalldef fact(x, acc=1): if (x > 1): return (fact((x - 1), (acc * x))) else: return accprint(fact(6))
#有一年 Python 经验的程序员
- def Factorial(x):
- res = 1
- for i in xrange(2, x + 1):
- res *= i
- return res
- print Factorial(6)
def Factorial(x): res = 1 for i in xrange(2, x + 1): res *= i return resprint 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)
def fact(x): return x > 1 and x * fact(x - 1) or 1print fact(6)
#更懒惰的Python程序员
- f = lambda x: x and x * f(x - 1) or 1
- print f(6)
f = lambda x: x and x * f(x - 1) or 1print f(6)
#专家级Python程序员
- import operator as op
- import functional as f
- fact = lambda x: f.foldl(op.mul, 1, xrange(2, x + 1))
- print fact(6)
import operator as opimport functional as ffact = 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’)
import sys@tailcalldef fact(x, acc=1): if x: return fact(x.__sub__(1), acc.__mul__(x)) return accsys.stdout.write(str(fact(6)) + '\n')
#专家级程序员
- import c_math
- fact = c_math.fact
- print fact(6)
import c_mathfact = c_math.factprint fact(6)
#英国专家级程序员 (译注:在英式英语中,“数学”的简写,多用“maths”,不是“math”。)
- import c_maths
- fact = c_maths.fact
- print fact(6)
import c_mathsfact = c_maths.factprint fact(6)
#网页设计师
- def factorial(x):
- #————————————————-
- #— 这段代码是从 Math Vault 那弄过来滴—
- #— 计算阶乘 (C)亚瑟·史密斯 1999年—
- #————————————————-
- result = str(1)
- i = 1 #谢谢亚当
- 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)
def factorial(x): #------------------------------------------------- #--- 这段代码是从 Math Vault 那弄过来滴--- #--- 计算阶乘 (C)亚瑟·史密斯 1999年--- #------------------------------------------------- result = str(1) i = 1 #谢谢亚当 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 resultprint factorial(6)
#Unix 程序员
- import os
- def fact(x):
- os.system(‘factorial ’ + str(x))
- fact(6)
import osdef 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)
NULL = Nonedef 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 1import sysCalculateAndPrintFactorialEx(6, sys.stdout, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)
#企业程序员
- 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))
def new(cls, *args, **kwargs): return cls(*args, **kwargs)class Number(object): passclass 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.__instanceclass 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 resultprint StandardMathematicsSystem.getInstance(new (InternalBase, new (IntegralNumber, 2))).calculateFactorial(new (IntegralNumber, 6))
下面代码是kohashi给出的,他说是在邮局看到的。
- #VBA 程序员
- def factorial(x):
- if x == 0:
- return 1
- if x == 1:
- return x
- if x == 2:
- return x * (x-1)
- if x == 3:
- return x * (x-1) * (x-2)
- if x == 4:
- return x * (x-1) * (x-2) * (x-3)
- if x == 5:
- return x * (x-1) * (x-2) * (x-3) * (x-4)
- if x == 6:
- return x * (x-1) * (x-2) * (x-3) * (x-4) * (x-5)
- print factorial(6)
#VBA 程序员def factorial(x): if x == 0: return 1 if x == 1: return x if x == 2: return x * (x-1) if x == 3: return x * (x-1) * (x-2) if x == 4: return x * (x-1) * (x-2) * (x-3) if x == 5: return x * (x-1) * (x-2) * (x-3) * (x-4) if x == 6: return x * (x-1) * (x-2) * (x-3) * (x-4) * (x-5)print factorial(6)
原文:fmeyer 编译:伯乐在线 – 黄利民
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