在while循环中如何连接两个值？

Question

print("Welcome to the CALCULATORBRO. Please type 'finish' when you have finished.")
CALCULATOR = []
number = ""
operator = ""
while number or operator != "finish":
    number = input("Please insert a number.")
    while number.isdigit() is False:
        number = input("Please insert a number")
        CALCULATOR.append(number)
        operator = input("Insert an operator.")
        OPERATORLIST = ["+", "-", "/", "*"]
        while operator not in OPERATORLIST:
            operator = input("Please insert an operator.")
            CALCULATOR.append(operator)

嘿你好啊！我已经学习Python 3-4天了，并编写了类似this3的代码。我的计划是将列表中的值(计算器)作为操作执行。但是，我无法正确地完成第一个while循环。如何对“运算符”和“数字”输入应用while循环？

非常感谢。

Answer 1

将while number or operator != "finish":更改为while number != "finish" and operator != "finish":。

while number or operator != "finish":首先查看bool(number)是否为True (当字符串包含某些内容时，这将是True )，然后查看operator是否为不相等的"finish"，然后查看结果之一是否为True。

Answer 2

只要用户提供break，您就可以在循环中使用while循环。

如果您使用while number or operator != "finish":，则会出现一个问题，因为您正在使用

while number.isdigit() is False:
    number = (input("Please insert a number"))

Use不能提供finish，因为用户无法脱离循环。用户必须强制提供一个数字。

print("Welcome to the CALCULATORBRO. Please type 'finish' when you have finished.")
CALCULATOR = []
number = ""
operator = ""
while True:
    number = input("Please insert a number 1: ")
    if (number == 'finish'): # break the loop and come out
        break
    while number.isdigit() is False:
        number = (input("Please insert a number2: "))
        if (number == 'finish'): # break the loop and come out
            break
    CALCULATOR.append(number)
    operator = input("Insert an operator.")
    if (operator == 'finish'):# break the loop and come out
        break
    OPERATORLIST = ["+", "-", "/", "*"]
    while operator not in OPERATORLIST:
        operator = input("Please insert an operator.")
        if (operator == 'finish'): # break the loop and come out
            break
    CALCULATOR.append(operator)
    number = input("Please insert a number 2: ")
    if (number == 'finish'):# break the loop and come out
        break
    while number.isdigit() is False:
        number = (input("Please insert a number 2: "))
        if (number == 'finish'): # break the loop and come out
            break
    CALCULATOR.append(number)
    print('result',eval("".join(CALCULATOR)))