趣文：Python程序员的进化史

pasckr

                                                   

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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。 :)

[color=#999999 !important]#新手程序员
def[color=#006FE0 !important] [color=teal !important]factorial[color=#333333 !important]([color=#002D7A !important]x[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    if[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] == [color=#009999 !important]0[color=#006FE0 !important]:
[color=#006FE0 !important]        return[color=#006FE0 !important] [color=#009999 !important]1
[color=#006FE0 !important]    else[color=#006FE0 !important]:
[color=#006FE0 !important]        return[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] * [color=teal !important]factorial[color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important] - [color=#009999 !important]1[color=#333333 !important])
[color=teal !important]print[color=#006FE0 !important] [color=teal !important]factorial[color=#333333 !important]([color=#009999 !important]6[color=#333333 !important])

[color=#999999 !important]#有一年 Pascal 经验的程序员
def[color=#006FE0 !important] [color=teal !important]factorial[color=#333333 !important]([color=#002D7A !important]x[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    [color=#002D7A !important]result[color=#006FE0 !important] = [color=#009999 !important]1
[color=#006FE0 !important]    [color=#002D7A !important]i[color=#006FE0 !important] = [color=#009999 !important]2
[color=#006FE0 !important]    while[color=#006FE0 !important] [color=#002D7A !important]i[color=#006FE0 !important] &[color=#002D7A !important]lt[color=#333333 !important];[color=#006FE0 !important]= [color=#002D7A !important]x[color=#006FE0 !important]:
[color=#006FE0 !important]        [color=#002D7A !important]result[color=#006FE0 !important] = [color=#002D7A !important]result[color=#006FE0 !important] * i
[color=#006FE0 !important]        [color=#002D7A !important]i[color=#006FE0 !important] = [color=#002D7A !important]i[color=#006FE0 !important] + [color=#009999 !important]1
[color=#006FE0 !important]    return[color=#006FE0 !important] [color=teal !important]result
[color=teal !important]print[color=#006FE0 !important] [color=teal !important]factorial[color=#333333 !important]([color=#009999 !important]6[color=#333333 !important])

[color=#999999 !important]#有一年 C 经验的程序员
def[color=#006FE0 !important] [color=teal !important]fact[color=#333333 !important]([color=#002D7A !important]x[color=#333333 !important])[color=#006FE0 !important]: [color=#999999 !important]#{
[color=#006FE0 !important]    [color=#002D7A !important]result[color=#006FE0 !important] = [color=#002D7A !important]i[color=#006FE0 !important] = [color=#009999 !important]1[color=#333333 !important];
[color=#006FE0 !important]    while[color=#006FE0 !important] [color=#333333 !important]([color=#002D7A !important]i[color=#006FE0 !important] &[color=#002D7A !important]lt[color=#333333 !important];[color=#006FE0 !important]= [color=#002D7A !important]x[color=#333333 !important])[color=#006FE0 !important]: [color=#999999 !important]#{
[color=#006FE0 !important]        [color=#002D7A !important]result[color=#006FE0 !important] *= [color=#002D7A !important]i[color=#333333 !important];
[color=#006FE0 !important]        [color=#002D7A !important]i[color=#006FE0 !important] += [color=#009999 !important]1[color=#333333 !important];
[color=#006FE0 !important]    [color=#999999 !important]#}
[color=#006FE0 !important]    return[color=#006FE0 !important] [color=#002D7A !important]result[color=#333333 !important];
[color=#999999 !important]#}
[color=teal !important]print[color=#333333 !important]([color=teal !important]fact[color=#333333 !important]([color=#009999 !important]6[color=#333333 !important]))

[color=#999999 !important]#有一年 SICP 经验的程序员
[color=#333333 !important]@[color=teal !important]tailcall
def[color=#006FE0 !important] [color=teal !important]fact[color=#333333 !important]([color=#002D7A !important]x[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]acc[color=#006FE0 !important]=[color=#009999 !important]1[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    if[color=#006FE0 !important] [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important] &[color=#002D7A !important]gt[color=#333333 !important];[color=#006FE0 !important] [color=#009999 !important]1[color=#333333 !important])[color=#006FE0 !important]: return[color=#006FE0 !important] [color=#333333 !important]([color=teal !important]fact[color=#333333 !important](([color=#002D7A !important]x[color=#006FE0 !important] - [color=#009999 !important]1[color=#333333 !important]),[color=#006FE0 !important] [color=#333333 !important]([color=#002D7A !important]acc[color=#006FE0 !important] * [color=#002D7A !important]x[color=#333333 !important])))
[color=#006FE0 !important]    else[color=#006FE0 !important]: return[color=#006FE0 !important] [color=teal !important]acc
[color=teal !important]print[color=#333333 !important]([color=teal !important]fact[color=#333333 !important]([color=#009999 !important]6[color=#333333 !important]))

[color=#999999 !important]#有一年 Python 经验的程序员
def[color=#006FE0 !important] [color=teal !important]Factorial[color=#333333 !important]([color=#002D7A !important]x[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    [color=#002D7A !important]res[color=#006FE0 !important] = [color=#009999 !important]1
[color=#006FE0 !important]    for[color=#006FE0 !important] i[color=#006FE0 !important] in[color=#006FE0 !important] [color=teal !important]xrange[color=#333333 !important]([color=#009999 !important]2[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] + [color=#009999 !important]1[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]        [color=#002D7A !important]res[color=#006FE0 !important] *= i
[color=#006FE0 !important]    return[color=#006FE0 !important] [color=teal !important]res
[color=teal !important]print[color=#006FE0 !important] [color=teal !important]Factorial[color=#333333 !important]([color=#009999 !important]6[color=#333333 !important])

[color=#999999 !important]#懒惰的Python程序员
def[color=#006FE0 !important] [color=teal !important]fact[color=#333333 !important]([color=#002D7A !important]x[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    return[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] &[color=#002D7A !important]gt[color=#333333 !important];[color=#006FE0 !important] [color=#009999 !important]1[color=#006FE0 !important] and[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] * [color=teal !important]fact[color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important] - [color=#009999 !important]1[color=#333333 !important])[color=#006FE0 !important] or[color=#006FE0 !important] [color=#009999 !important]1
[color=teal !important]print[color=#006FE0 !important] [color=teal !important]fact[color=#333333 !important]([color=#009999 !important]6[color=#333333 !important])

[color=#999999 !important]#更懒惰的Python程序员
[color=#002D7A !important]f[color=#006FE0 !important] = lambda[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important]: x[color=#006FE0 !important] and[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] * [color=teal !important]f[color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important] - [color=#009999 !important]1[color=#333333 !important])[color=#006FE0 !important] or[color=#006FE0 !important] [color=#009999 !important]1
[color=teal !important]print[color=#006FE0 !important] [color=teal !important]f[color=#333333 !important]([color=#009999 !important]6[color=#333333 !important])

[color=#999999 !important]#专家级Python程序员
import[color=#006FE0 !important] [color=teal !important]operator[color=#006FE0 !important] as[color=#006FE0 !important] [color=teal !important]op
import[color=#006FE0 !important] [color=teal !important]functional as[color=#006FE0 !important] f
[color=#002D7A !important]fact[color=#006FE0 !important] = lambda[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important]: [color=#002D7A !important]f[color=#333333 !important].[color=teal !important]foldl[color=#333333 !important]([color=#002D7A !important]op[color=#333333 !important].[color=#002D7A !important]mul[color=#333333 !important],[color=#006FE0 !important] [color=#009999 !important]1[color=#333333 !important],[color=#006FE0 !important] [color=teal !important]xrange[color=#333333 !important]([color=#009999 !important]2[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] + [color=#009999 !important]1[color=#333333 !important]))
[color=teal !important]print[color=#006FE0 !important] [color=teal !important]fact[color=#333333 !important]([color=#009999 !important]6[color=#333333 !important])

[color=#999999 !important]#Python 黑客
import[color=#006FE0 !important] [color=teal !important]sys
[color=#333333 !important]@[color=teal !important]tailcall
def[color=#006FE0 !important] [color=teal !important]fact[color=#333333 !important]([color=#002D7A !important]x[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]acc[color=#006FE0 !important]=[color=#009999 !important]1[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    if[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important]: return[color=#006FE0 !important] [color=teal !important]fact[color=#333333 !important]([color=#002D7A !important]x[color=#333333 !important].[color=teal !important]__sub__[color=#333333 !important]([color=#009999 !important]1[color=#333333 !important]),[color=#006FE0 !important] [color=#002D7A !important]acc[color=#333333 !important].[color=teal !important]__mul__[color=#333333 !important]([color=#002D7A !important]x[color=#333333 !important]))
[color=#006FE0 !important]    return[color=#006FE0 !important] [color=teal !important]acc
[color=teal !important]sys[color=#333333 !important].[color=#002D7A !important]stdout[color=#333333 !important].[color=teal !important]write[color=#333333 !important]([color=teal !important]str[color=#333333 !important]([color=teal !important]fact[color=#333333 !important]([color=#009999 !important]6[color=#333333 !important]))[color=#006FE0 !important] + [color=#DD1144 !important]'\n'[color=#333333 !important])

[color=#999999 !important]#专家级程序员
import[color=#006FE0 !important] [color=teal !important]c_math
[color=#002D7A !important]fact[color=#006FE0 !important] = [color=#002D7A !important]c_math[color=#333333 !important].[color=teal !important]fact
[color=teal !important]print[color=#006FE0 !important] [color=teal !important]fact[color=#333333 !important]([color=#009999 !important]6[color=#333333 !important])

[color=#999999 !important]#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[color=#006FE0 !important] [color=teal !important]c_maths
[color=#002D7A !important]fact[color=#006FE0 !important] = [color=#002D7A !important]c_maths[color=#333333 !important].[color=teal !important]fact
[color=teal !important]print[color=#006FE0 !important] [color=teal !important]fact[color=#333333 !important]([color=#009999 !important]6[color=#333333 !important])

[color=#999999 !important]#网页设计师
def[color=#006FE0 !important] [color=teal !important]factorial[color=#333333 !important]([color=#002D7A !important]x[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    [color=#999999 !important]#-------------------------------------------------
[color=#006FE0 !important]    [color=#999999 !important]#--- 这段代码是从 Math Vault 那弄过来滴---
[color=#006FE0 !important]    [color=#999999 !important]#--- 计算阶乘 （C）亚瑟·史密斯 1999年---
[color=#006FE0 !important]    [color=#999999 !important]#-------------------------------------------------
[color=#006FE0 !important]    [color=#002D7A !important]result[color=#006FE0 !important] = [color=teal !important]str[color=#333333 !important]([color=#009999 !important]1[color=#333333 !important])
[color=#006FE0 !important]    [color=#002D7A !important]i[color=#006FE0 !important] = [color=#009999 !important]1[color=#006FE0 !important] [color=#999999 !important]#谢谢亚当
[color=#006FE0 !important]    while[color=#006FE0 !important] [color=#002D7A !important]i[color=#006FE0 !important] &[color=#002D7A !important]lt[color=#333333 !important];[color=#006FE0 !important]= [color=#002D7A !important]x[color=#006FE0 !important]:
[color=#006FE0 !important]        [color=#999999 !important]#result = result * i #It's faster to use *=
[color=#006FE0 !important]        [color=#999999 !important]#result = str(result * result + i)
[color=#006FE0 !important]           [color=#999999 !important]#result = int(result *= i) #??????
[color=#006FE0 !important]        [color=teal !important]result str[color=#333333 !important]([color=teal !important]int[color=#333333 !important]([color=#002D7A !important]result[color=#333333 !important])[color=#006FE0 !important] * [color=#002D7A !important]i[color=#333333 !important])
[color=#006FE0 !important]        [color=#999999 !important]#result = int(str(result) * i)
[color=#006FE0 !important]        [color=#002D7A !important]i[color=#006FE0 !important] = [color=#002D7A !important]i[color=#006FE0 !important] + [color=#009999 !important]1
[color=#006FE0 !important]    return[color=#006FE0 !important] [color=teal !important]result
[color=teal !important]print[color=#006FE0 !important] [color=teal !important]factorial[color=#333333 !important]([color=#009999 !important]6[color=#333333 !important])

[color=#999999 !important]#Unix 程序员
import[color=#006FE0 !important] [color=teal !important]os
def[color=#006FE0 !important] [color=teal !important]fact[color=#333333 !important]([color=#002D7A !important]x[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    [color=teal !important]os[color=#333333 !important].[color=teal !important]system[color=#333333 !important]([color=#DD1144 !important]'factorial '[color=#006FE0 !important] + [color=teal !important]str[color=#333333 !important]([color=#002D7A !important]x[color=#333333 !important]))
[color=teal !important]fact[color=#333333 !important]([color=#009999 !important]6[color=#333333 !important])

[color=#999999 !important]#Windows 程序员
[color=#002D7A !important]NULL[color=#006FE0 !important] = [color=#800080 !important]None
def[color=#006FE0 !important] [color=teal !important]CalculateAndPrintFactorialEx[color=#333333 !important]([color=#002D7A !important]dwNumber[color=#333333 !important],
[color=#006FE0 !important]                                 [color=#002D7A !important]hOutputDevice[color=#333333 !important],
[color=#006FE0 !important]                                 [color=#002D7A !important]lpLparam[color=#333333 !important],
[color=#006FE0 !important]                                 [color=#002D7A !important]lpWparam[color=#333333 !important],
[color=#006FE0 !important]                                 [color=#002D7A !important]lpsscSecurity[color=#333333 !important],
[color=#006FE0 !important]                                 *[color=#002D7A !important]dwReserved[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    if[color=#006FE0 !important] [color=#002D7A !important]lpsscSecurity[color=#006FE0 !important] != [color=#002D7A !important]NULL[color=#006FE0 !important]:
[color=#006FE0 !important]        return[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#006FE0 !important] [color=#999999 !important]#Not implemented
[color=#006FE0 !important]    [color=#002D7A !important]dwResult[color=#006FE0 !important] = [color=#002D7A !important]dwCounter[color=#006FE0 !important] = [color=#009999 !important]1
[color=#006FE0 !important]    while[color=#006FE0 !important] [color=#002D7A !important]dwCounter[color=#006FE0 !important] &[color=#002D7A !important]lt[color=#333333 !important];[color=#006FE0 !important]= [color=#002D7A !important]dwNumber[color=#006FE0 !important]:
[color=#006FE0 !important]        [color=#002D7A !important]dwResult[color=#006FE0 !important] *= [color=teal !important]dwCounter
[color=teal !important]        [color=#002D7A !important]dwCounter[color=#006FE0 !important] += [color=#009999 !important]1
[color=#006FE0 !important]    [color=#002D7A !important]hOutputDevice[color=#333333 !important].[color=teal !important]write[color=#333333 !important]([color=teal !important]str[color=#333333 !important]([color=#002D7A !important]dwResult[color=#333333 !important]))
[color=#006FE0 !important]    [color=#002D7A !important]hOutputDevice[color=#333333 !important].[color=teal !important]write[color=#333333 !important]([color=#DD1144 !important]'\n'[color=#333333 !important])
[color=#006FE0 !important]    return[color=#006FE0 !important] [color=#009999 !important]1
import[color=#006FE0 !important] [color=teal !important]sys
[color=teal !important]CalculateAndPrintFactorialEx[color=#333333 !important]([color=#009999 !important]6[color=#333333 !important],[color=#006FE0 !important] [color=teal !important]sys[color=#333333 !important].[color=#002D7A !important]stdout[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]NULL[color=#333333 !important])

[color=#999999 !important]#企业程序员
def[color=#006FE0 !important] [color=teal !important]new[color=#333333 !important]([color=#002D7A !important]cls[color=#333333 !important],[color=#006FE0 !important] *[color=#002D7A !important]args[color=#333333 !important],[color=#006FE0 !important] **[color=#002D7A !important]kwargs[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    return[color=#006FE0 !important] [color=teal !important]cls[color=#333333 !important]([color=#006FE0 !important]*[color=#002D7A !important]args[color=#333333 !important],[color=#006FE0 !important] **[color=#002D7A !important]kwargs[color=#333333 !important])

[color=#800080 !important]class[color=#006FE0 !important] [color=teal !important]Number[color=#333333 !important]([color=teal !important]object[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    pass

[color=#800080 !important]class[color=#006FE0 !important] [color=teal !important]IntegralNumber[color=#333333 !important]([color=teal !important]int[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]Number[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    def[color=#006FE0 !important] [color=teal !important]toInt[color=#333333 !important](self[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]        return[color=#006FE0 !important] [color=teal !important]new[color=#006FE0 !important] [color=#333333 !important]([color=teal !important]int[color=#333333 !important],[color=#006FE0 !important] self[color=#333333 !important])

[color=#800080 !important]class[color=#006FE0 !important] [color=teal !important]InternalBase[color=#333333 !important]([color=teal !important]object[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    def[color=#006FE0 !important] [color=teal !important]__init__[color=#333333 !important](self[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]base[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]        self[color=#333333 !important].[color=#002D7A !important]base[color=#006FE0 !important] = [color=#002D7A !important]base[color=#333333 !important].[color=teal !important]toInt[color=#333333 !important]()

[color=#006FE0 !important]    def[color=#006FE0 !important] [color=teal !important]getBase[color=#333333 !important](self[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]        return[color=#006FE0 !important] [color=teal !important]new[color=#006FE0 !important] [color=#333333 !important]([color=#002D7A !important]IntegralNumber[color=#333333 !important],[color=#006FE0 !important] self[color=#333333 !important].[color=#002D7A !important]base[color=#333333 !important])

[color=#800080 !important]class[color=#006FE0 !important] [color=teal !important]MathematicsSystem[color=#333333 !important]([color=teal !important]object[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    def[color=#006FE0 !important] [color=teal !important]__init__[color=#333333 !important](self[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]ibase[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]        Abstract

[color=#006FE0 !important]    [color=#333333 !important]@[color=teal !important]classmethod
[color=#006FE0 !important]    def[color=#006FE0 !important] [color=teal !important]getInstance[color=#333333 !important]([color=#002D7A !important]cls[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]ibase[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]        try[color=#006FE0 !important]:
[color=#006FE0 !important]            [color=#002D7A !important]cls[color=#333333 !important].[color=teal !important]__instance
[color=teal !important]        except[color=#006FE0 !important] [color=teal !important]AttributeError[color=#006FE0 !important]:
[color=#006FE0 !important]            [color=#002D7A !important]cls[color=#333333 !important].[color=#002D7A !important]__instance[color=#006FE0 !important] = [color=teal !important]new[color=#006FE0 !important] [color=#333333 !important]([color=#002D7A !important]cls[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]ibase[color=#333333 !important])
[color=#006FE0 !important]        return[color=#006FE0 !important] [color=#002D7A !important]cls[color=#333333 !important].[color=teal !important]__instance

[color=#800080 !important]class[color=#006FE0 !important] [color=teal !important]StandardMathematicsSystem[color=#333333 !important]([color=#002D7A !important]MathematicsSystem[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    def[color=#006FE0 !important] [color=teal !important]__init__[color=#333333 !important](self[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]ibase[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]        if[color=#006FE0 !important] [color=#002D7A !important]ibase[color=#333333 !important].[color=teal !important]getBase[color=#333333 !important]()[color=#006FE0 !important] != [color=teal !important]new[color=#006FE0 !important] [color=#333333 !important]([color=#002D7A !important]IntegralNumber[color=#333333 !important],[color=#006FE0 !important] [color=#009999 !important]2[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]            raise[color=#006FE0 !important] [color=teal !important]NotImplementedError
[color=#006FE0 !important]        self[color=#333333 !important].[color=#002D7A !important]base[color=#006FE0 !important] = [color=#002D7A !important]ibase[color=#333333 !important].[color=teal !important]getBase[color=#333333 !important]()

[color=#006FE0 !important]    def[color=#006FE0 !important] [color=teal !important]calculateFactorial[color=#333333 !important](self[color=#333333 !important],[color=#006FE0 !important] [color=#002D7A !important]target[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]        [color=#002D7A !important]result[color=#006FE0 !important] = [color=teal !important]new[color=#006FE0 !important] [color=#333333 !important]([color=#002D7A !important]IntegralNumber[color=#333333 !important],[color=#006FE0 !important] [color=#009999 !important]1[color=#333333 !important])
[color=#006FE0 !important]        [color=#002D7A !important]i[color=#006FE0 !important] = [color=teal !important]new[color=#006FE0 !important] [color=#333333 !important]([color=#002D7A !important]IntegralNumber[color=#333333 !important],[color=#006FE0 !important] [color=#009999 !important]2[color=#333333 !important])
[color=#006FE0 !important]        while[color=#006FE0 !important] [color=#002D7A !important]i[color=#006FE0 !important] &[color=#002D7A !important]lt[color=#333333 !important];[color=#006FE0 !important]= [color=#002D7A !important]target[color=#006FE0 !important]:
[color=#006FE0 !important]            [color=#002D7A !important]result[color=#006FE0 !important] = [color=#002D7A !important]result[color=#006FE0 !important] * i
[color=#006FE0 !important]            [color=#002D7A !important]i[color=#006FE0 !important] = [color=#002D7A !important]i[color=#006FE0 !important] + [color=teal !important]new[color=#006FE0 !important] [color=#333333 !important]([color=#002D7A !important]IntegralNumber[color=#333333 !important],[color=#006FE0 !important] [color=#009999 !important]1[color=#333333 !important])
[color=#006FE0 !important]        return[color=#006FE0 !important] [color=teal !important]result

[color=teal !important]print[color=#006FE0 !important] [color=#002D7A !important]StandardMathematicsSystem[color=#333333 !important].[color=teal !important]getInstance[color=#333333 !important]([color=teal !important]new[color=#006FE0 !important] [color=#333333 !important]([color=#002D7A !important]InternalBase[color=#333333 !important],[color=#006FE0 !important] [color=teal !important]new[color=#006FE0 !important] [color=#333333 !important]([color=#002D7A !important]IntegralNumber[color=#333333 !important],[color=#006FE0 !important] [color=#009999 !important]2[color=#333333 !important]))).[color=teal !important]calculateFactorial[color=#333333 !important]([color=teal !important]new[color=#006FE0 !important] [color=#333333 !important]([color=#002D7A !important]IntegralNumber[color=#333333 !important],[color=#006FE0 !important] [color=#009999 !important]6[color=#333333 !important]))

下面代码是kohashi给出的，他说是在邮局看到的。

[color=#999999 !important]#VBA 程序员
def[color=#006FE0 !important] [color=teal !important]factorial[color=#333333 !important]([color=#002D7A !important]x[color=#333333 !important])[color=#006FE0 !important]:
[color=#006FE0 !important]    if[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] == [color=#009999 !important]0[color=#006FE0 !important]:
[color=#006FE0 !important]        return[color=#006FE0 !important] [color=#009999 !important]1
[color=#006FE0 !important]    if[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] == [color=#009999 !important]1[color=#006FE0 !important]:
[color=#006FE0 !important]        return[color=#006FE0 !important] x
[color=#006FE0 !important]    if[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] == [color=#009999 !important]2[color=#006FE0 !important]:
[color=#006FE0 !important]        return[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] * [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important]-[color=#009999 !important]1[color=#333333 !important])
[color=#006FE0 !important]    if[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] == [color=#009999 !important]3[color=#006FE0 !important]:
[color=#006FE0 !important]        return[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] * [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important]-[color=#009999 !important]1[color=#333333 !important])[color=#006FE0 !important] * [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important]-[color=#009999 !important]2[color=#333333 !important])
[color=#006FE0 !important]    if[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] == [color=#009999 !important]4[color=#006FE0 !important]:
[color=#006FE0 !important]        return[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] * [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important]-[color=#009999 !important]1[color=#333333 !important])[color=#006FE0 !important] * [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important]-[color=#009999 !important]2[color=#333333 !important])[color=#006FE0 !important] * [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important]-[color=#009999 !important]3[color=#333333 !important])
[color=#006FE0 !important]    if[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] == [color=#009999 !important]5[color=#006FE0 !important]:
[color=#006FE0 !important]        return[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] * [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important]-[color=#009999 !important]1[color=#333333 !important])[color=#006FE0 !important] * [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important]-[color=#009999 !important]2[color=#333333 !important])[color=#006FE0 !important] * [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important]-[color=#009999 !important]3[color=#333333 !important])[color=#006FE0 !important] * [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important]-[color=#009999 !important]4[color=#333333 !important])
[color=#006FE0 !important]    if[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] == [color=#009999 !important]6[color=#006FE0 !important]:
[color=#006FE0 !important]        return[color=#006FE0 !important] [color=#002D7A !important]x[color=#006FE0 !important] * [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important]-[color=#009999 !important]1[color=#333333 !important])[color=#006FE0 !important] * [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important]-[color=#009999 !important]2[color=#333333 !important])[color=#006FE0 !important] * [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important]-[color=#009999 !important]3[color=#333333 !important])[color=#006FE0 !important] * [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important]-[color=#009999 !important]4[color=#333333 !important])[color=#006FE0 !important] * [color=#333333 !important]([color=#002D7A !important]x[color=#006FE0 !important]-[color=#009999 !important]5[color=#333333 !important])
[color=teal !important]print[color=#006FE0 !important] [color=teal !important]factorial[color=#333333 !important]([color=#009999 !important]6[color=#333333 !important])

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