Python 如果用户输入正确的运算符，则停止 while 循环

发布于08月06日

我昨天刚开始学习Python，我正在try 编写的程序之一就是计算器.这段代码就是我遇到问题的地方.While循环应该在用户输入任何数学运算符时停止，但它仍然要求输入，即使用户输入了正确的字符.

我需要做些什么才能解决这个问题.

    op = None                                 
    while (op != "-" or op != "+" or op != "*" or op != "/"):
        op = input("Enter operator (-, +, *, /):  ")
    print(op)

推荐答案

  op = None                                 
while op not in ["-","+","*","/"]:
    op = input("Enter operat或 (-, +, *, /):  ")
print(op)

或

op = None                                 
while (op != "-" and op != "+" and op != "*" and op != "/"):
    op = input("Enter operat或 (-, +, *, /):  ")
print(op)

your code isnt w或king because while "op" might be equal to one of your options, its not equal to all the others, and theref或e continues the loop