Python计算器迭代逻辑修复与指定指令实现问询

核心修改说明 #

• 移除冗余的重复操作选择循环，整合主逻辑到一个循环中
• 修复select_op的递归调用问题，改用循环内部处理避免栈溢出
• 调整操作数与操作符的获取时机，确保每次计算后可重新输入
• 修正除法逻辑的判断顺序，先检查除数是否为0再执行计算
• 实现$结尾重新询问操作、#结尾终止程序的功能

优化后完整代码 #

# -------------------------------------
# TODO: Write the select_op(choice) function here
# This function should cover Task 1 (Section 2) and Task 3
def select_op():
    while True:
        choice = input("Enter choice(+,-,*,/,^,%,#,$): ")
        # 处理以$结尾的情况：重新询问操作
        if choice.endswith("$"):
            print("Reset operation selection...")
            continue
        # 处理以#结尾的情况：终止程序
        elif choice.endswith("#"):
            print("Done. Terminating")
            exit()
        # 处理无效操作
        elif choice not in ("+", "-", "*", "/", "^", "%"):
            print("Unrecognized operation")
            continue
        else:
            return choice

def select_operand():
    try:
        first_operand = float(input("Enter the first number: "))
        return first_operand
    except ValueError:
        print("Not a valid number. Please enter again.")
        return select_operand()

def select_operand_2():
    try:
        second_operand = float(input("Enter the second number: "))
        return second_operand
    except ValueError:
        print("Not a valid number. Please enter again.")
        return select_operand_2()

def operation(choice, first_operand, second_operand):
    if choice == "+":
        print(f"Result: {first_operand + second_operand}")
    elif choice == "-":
        print(f"Result: {first_operand - second_operand}")
    elif choice == "*":
        print(f"Result: {first_operand * second_operand}")
    elif choice == "/":
        if second_operand == 0:
            print("Division by zero is not allowed")
        else:
            print(f"Result: {first_operand / second_operand}")
    elif choice == "^":
        print(f"Result: {first_operand ** second_operand}")
    elif choice == "%":
        print(f"Result: {first_operand % second_operand}")

# 主循环：实现重复计算功能
while True:
    print("\nSelect operation.")
    print("1.Add      : + ")
    print("2.Subtract : - ")
    print("3.Multiply : * ")
    print("4.Divide   : / ")
    print("5.Power    : ^ ")
    print("6.Remainder: % ")
    print("7.Terminate: # ")
    print("8.Reset    : $ ")
    
    # 获取操作选择
    choice = select_op()
    # 获取操作数
    first_num = select_operand()
    second_num = select_operand_2()
    # 执行计算
    operation(choice, first_num, second_num)

关键修改细节 #

1. select_op函数优化：

   • 移除递归调用，改用continue重新发起询问，避免栈溢出
   • 调整判断顺序，优先处理$和#的结尾情况
   • 无效操作时用continue重新循环，而非递归

2. 主逻辑整合：

   • 将操作选择、操作数获取、计算逻辑放入同一个while True循环，实现重复执行
   • 每次循环重新打印操作菜单，符合重复计算的交互流程

3. 除法逻辑修复：

   • 先判断除数是否为0，再执行除法计算，避免错误输出

4. 交互体验优化：

   • 计算结果添加Result:前缀，输出更清晰
   • 操作选择前添加换行，界面更整洁

内容的提问来源于stack exchange，提问作者Niki Jr