python - 我的 while 验证循环不接受有效答案并中断，自动移动到 else 语句

Question

    # this is a simple calculator
import sys


def calculation():
    print('what is the first number?')
    x = int(input())
    print('what is the second number?')
    y = int(input())
    # these two lines ask for the two numbers
    print('would you like to do multiplication, division, addition, or subtraction?')
    # the following loop makes the user choose which operator they wish to use
    while True:
        input_a = input()
        if input_a == 'multiplication' or input_a == 'division' or input_a == 'addition' or input_a == 'subtraction':
            break
        else:
            print('please choose a valid option')
    if input_a == 'multiplication':  # the multiplication calculation
        print(str(x) + ' multiplied by ' + str(y) + ' is equal to:')

        def multiply():
            return x*y

        print(multiply())
    elif input_a == 'division':
        print(str(x) + ' divided by ' + str(y) + ' is equal to:')

        def divide():
            try:
                return x/y
            except ZeroDivisionError:
                print('you cannot divide by zero')

        print(divide())


print(calculation())
while True:  #this loop repeats the program
    calculation()
    print('would you like to repeat? y/n')
    input_b = input()
    if input_b == 'n':
        sys.exit()

我不太清楚为什么，但是在我的 while 验证循环中，即使给出了一个有效的答案，它仍然不会中断

请允许我事先道歉，但我现在只编写 python 大约 3 天，所以如果我的代码可以通过使用不同的方法得到更好的优化，这就是我没有这样做的原因

但是由于某种原因，当我没有将整个程序定义为函数时，它开始正常工作，但是我这样做是为了更容易让用户选择重新启动程序

编辑：所以我发现了问题，这是因为我正在尝试输入我实际上还没有编码，谢谢你提醒我检查我身边的错误

标签： python

Answer 1

给你，无论你在做什么都很复杂，所以这里是它的简单版本：

def add(x,y):   
    return(x+y)
def sub(x,y):   
    return(x-y)
def mult(x,y):  
    return(x*y)
def div(x,y):
    return(x/y)

while True:
    x=int(input('First No.: '))
    y=int(input('First No.: '))

    method=input('Operator: ')#will call a specific function from the dictionary
    functs={'add':add(x,y),'subtract':sub(x,y),'multiply':mult(x,y),'divide':div(x,y)}

    print(functs[method.lower()])#print the required result

    choice=input('Continue? Y/N: ')
    if choice=='N':
        break
print('Loop Break')