Question

我用Python创建了一个Monty Hall程序（证明了2/3到1/3的几率），但当我尽可能少地创建它时（我的个人兴趣）我得到了这些神秘的错误！这是代码：

from random import * 
i,a,abc,t,m=choice(['A','B','C']),raw_input('Switch? (y/n): ').upper(),['A','B','C'],0,0
for j in range(100):
    p = choice(abc)
    if ([y for y in abc if y not in [i,(choice([x for x in abc if x not in [i,p]]))]][0] if a == 'Y' else i) == p : t += 1
print 'WP: %i\nErrors: %i' %(t,m)

我收到了这个错误：

Traceback (most recent call last):
  File "fewlinesMonty.py", line 5, in <module>
    if ([y for y in abc if y not in [i,(choice([x for x in abc if x not in [i,p]]))]][0] if a == 'Y' else i) == p : t += 1
IndexError: list index out of range

所以，我使用try / except来计算使用此代码的错误：

from random import *
i,a,abc,t,m=choice(['A','B','C']),raw_input('Switch? (y/n): ').upper(),['A','B','C'],0,0
for j in range(100):
    p = choice(abc)
    try:
        if ([y for y in abc if y not in [i,(choice([x for x in abc if x not in [i,p]]))]][0] if a == 'Y' else i) == p : t += 1
    except: m += 1
print 'WP: %i\nErrors: %i' %(t,m)

错误从不超过10％，但这对我没有意义！

要修复错误，所有必要的是定义

o = choice([x for x in abc if x not in [i,p]])

然后用o。

替换相应的代码

我知道代码很难（有点不可能）阅读，但我感谢任何帮助/建议。

编辑：以下是变量的含义： i =初始门选择（随机）x =要打开的门（不是奖品，不是初始）y =要切换到的门（不是x，不是初始）abc =列表中的AB和C t =总赢得m =神秘的错误p =奖品（或＆＃39; car＆＃39;）的门是

Answer 1

更直接一点有什么不妥？

from random import choice
initial_guess, flip, wins=choice('ABC'),input('Switch? (y/n): ').upper()=="Y",0
for _ in range(100):
    actual_winner = choice('ABC')
    wins += 1 if (initial_guess == actual_winner and not flip) or (flip and initial_guess != actual_winner) else 0

print("WP: ", wins)

运行1

Switch? (y/n): y
WP:  62

运行2

Switch? (y/n): n
WP:  31

如果你真的想要最少的线：

from random import choice 
initial_guess, flip = choice('ABC'), input('Switch? (y/n): ') in ['y','Y']
print("WP: ", sum([[0,1],[1,0]][flip][initial_guess==choice('ABC')] for _ in range(100)))

Answer 2

感谢RobertB解决这个问题，这里是:(我确实做了一些次编辑）

from random import choice 
initial_guess, flip = choice('ABC'), raw_input('Switch? (y/n): ') in ['y','Y']
print "WP: " , sum([[0,1],[1,0]][flip][initial_guess==choice('ABC')] for i in range(100))

Monty Hall Python代码中的神秘错误

2 个答案: