python - 高/低游戏 : ValueError

Question

对于我的脚本类(class)，我们必须制作更高/更低的游戏。到目前为止，这是我的代码:

import random

seedVal = int(input("What seed should be used? "))
random.seed(seedVal)
lower = int(input("What is the lower bound? "))
upper = int(input("What is the upper bound? "))
number = random.randint(lower, upper)

while (True):
    guess = int(input("What is your guess? "))
    if(number < lower or number > upper):
        print("The number should be between the upper bound and the lower bound")
    elif(guess == number):
        print("You got it!")
        break
    elif(guess < number):
        print("Nope, too low.")
    else:
        print("Nope, too high.")

它已经用于 3/4 功能测试但是当我输入时它失败了:2个5个1个1个5个1个2个3个4个5

它给我的错误是:

Traceback (most recent call last):
  File "HigherLowerGame.py", line 7, in <module>
    number = random.randint(lower, upper)
  File "/usr/lib/python3.8/random.py", line 248, in randint
    return self.randrange(a, b+1)
  File "/usr/lib/python3.8/random.py", line 226, in randrange
    raise ValueError("empty range for randrange() (%d, %d, %d)" % (istart, istop, width))
ValueError: empty range for randrange() (5, 2, -3)

Answer 1

您必须检查 lower 是否大于 upper。也可以使用min/max取最低值和最高值:

lower = int(input("What is the lower bound? "))
upper = int(input("What is the upper bound? "))
number = random.randint(min(lower, upper), max(lower, upper))