计算器我想添加一个循环，表示“无效输入”并重新询问用户是否输入了不正确的字符不知道该怎么做

如何解决计算器我想添加一个循环，表示“无效输入”并重新询问用户是否输入了不正确的字符不知道该怎么做

print("Welcome to the calculator!")
print("Enter in the symbol for you desired equation")

math = input("Would you like to ( + ),( - ),( / ) or ( * )?\n")


if math == '*':
    mult = float(input("Give me the first number you would like to multiply\n"))
    mult1 = float(input("Give me the second number\n"))
    print(mult,"*",mult1,"=",float(mult * mult1))

if math == '/':
    div = float(input("Give me the first number you would like to divide\n"))
    div1 = float(input("Give me the second number\n"))
    print(div,"/",div1,float(div / div1))

if math == '+':
    add = float(input("Give me the first number you would like to add\n"))
    add1 = float(input("Give me the second number\n"))
    print(add,"+",add1,float(add+add1))

我想添加一个循环函数，它基本上会说“无效输入”并在用户输入无效字符时再次循环回到问题。

解决方法

换行

math = input("Would you like to ( + ),( - ),( / ) or ( * )?\n")

与

while True:
    math = input("Would you like to ( + ),( / ) or ( * )?\n")
    if math in "+-*/":
        break
    else:
        print('invalid entry')

应该能让你得到你正在寻找的行为。 break 命令退出循环。

您应该能够将其概括为其他输入语句。