如何为已编写的Python简易计算器添加循环功能？

要让计算器能重复执行计算，核心是用循环结构包裹程序的核心逻辑，直到用户选择退出为止。同时原代码存在缩进错误，需要一并修正，否则会运行报错。

修改后的完整代码 #

# Python program for simple calculator

# Function to add two numbers
def add(num1, num2):
    return num1 + num2

# Function to subtract two numbers
def subtract(num1, num2):
    return num1 - num2

# Function to multiply two numbers
def multiply(num1, num2):
    return num1 * num2

# Function to divide two numbers
def divide(num1, num2):
    return num1 / num2

while True:
    print("Welcome, please choose the operation:\n"
          "1. Addition\n"
          "2. Subtraction\n"
          "3. Multiplication\n"
          "4. Division\n"
          "5. Exit")

    # Take input from the user
    try:
        select = int(input("Please, Type the choice: "))
    except ValueError:
        print("Invalid input! Please enter a number between 1-5.")
        continue

    if select == 5:
        print("Thanks and goodbye")
        break

    try:
        number_1 = int(input("Enter number 1: "))
        number_2 = int(input("Enter number 2: "))
    except ValueError:
        print("Invalid number! Please enter integer values.")
        continue

    if select == 1:
        print(number_1, "+", number_2, "=", add(number_1, number_2))
    elif select == 2:
        print(number_1, "-", number_2, "=", subtract(number_1, number_2))
    elif select == 3:
        print(number_1, "*", number_2, "=", multiply(number_1, number_2))
    elif select == 4:
        if number_2 == 0:
            print('You cannot divide by zero')
        else:
            print(number_1, "/", number_2, "=", divide(number_1, number_2))
    else:
        print("Invalid choice! Please select an option between 1-5.")

关键修改说明 #

• 用while True创建无限循环，程序会一直运行，直到用户选择选项5时执行break退出循环
• 将操作菜单、用户选择输入、数字输入和计算逻辑全部放入循环内部，确保每次循环都能重新选择操作
• 新增输入验证（try-except块），避免用户输入非数字内容导致程序崩溃
• 修正原代码中混乱的缩进问题，保证代码语法正确
• 增加对无效选项的处理，提示用户输入正确范围的选项

内容的提问来源于stack exchange，提问作者David Heydenrych