python创建计算器，在重置循环时记住输入

def calculator():
    result = 0
    while True:
        if result == 0:
            num1 = float(input("请输入第一个数字："))
        else:
            num1 = result
        operator = input("请输入运算符（+、-、*、/）：")
        num2 = float(input("请输入第二个数字："))

        if operator == "+":
            result = num1 + num2
        elif operator == "-":
            result = num1 - num2
        elif operator == "*":
            result = num1 * num2
        elif operator == "/":
            result = num1 / num2
        else:
            print("无效的运算符，请重新输入！")
            continue

        print("计算结果：", result)

        choice = input("是否继续计算？（y/n）：")
        if choice.lower() != "y":
            break

calculator()