更高/更低的游戲：ValueError

Question

對於我的腳本 class，我們必須制作更高/更低的游戲。 到目前為止，這是我的代碼：

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.")

它適用於 3/4 功能測試，但是當我輸入時失敗：2 5 1 1 5 1 2 3 4 5

它給我的錯誤是：

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

我對 python 幾乎一無所知，但是對於該輸入序列，聽起來您要求 randint 生成一個隨機數，其中下限為 4，上限為 1，這是不可能的。

Answer 2

您必須檢查lower是否大於upper ：

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))