Python If语句和逻辑运算符问题 [英] Python If statement and logical operator issue

问题描述

我正在尝试创建一个小型python程序来模拟滚动单个骰子。我的问题出现在我希望程序接受大写和小写'Y'以触发重新滚动。当我接受大写或小写y但我尝试更改行时，我的程序有效

I'm trying to create a small python program to emulate rolling a single die. My problem arises in that I want the program to accept both upper and lower-case 'Y' to trigger a re-roll. My program works when I accept either upper or lower case y but when I try to change the line

if usr == 'Y'

到

if usr == 'Y' or 'y'

会产生问题永远不要输入else语句，使程序永远不会终止。

creates a problem where it never enters the else statement, making the program never terminate.

import random

def DiceRoll():
 number = random.randrange(1, 7, 1)
 print("Dice Roll: ", number)
 AskUser()
 return

def AskUser():
 usr = input("Roll Again? (Y/N) \n")
 if usr == 'Y':
     DiceRoll()
 else :
     print("Thank you for playing!")
return

DiceRoll()

推荐答案

你必须

if usr == 'Y' or usr == 'y'.

目前正在评估语句'y'作为自己的条件，在这种情况下'y'总是评估为真。

It is currently evaluating the statement 'y' as its own condition, and in this case 'y' always evaluates to true.

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