python - 属性错误 : 'int' object has no attribute 'isdigit' and NameError

Question

我正在尝试制作一个程序，如果我输入一个正数，它会进一步执行，但如果我输入一个负数或一个字母，它应该打印“房价必须是正数”，并且它应该要求再次输入。这是我到目前为止所做的，但是当我输入一个数字时，我得到一个 AttributeError，当我输入一个字母时，我得到一个 NameError。

import math

while True:
    home_price = input('Enter the price of your dreams house')
    if home_price.isdigit():
        if home_price > 0:    
            home_price = int(house_price)
            break
        else:
            print('House price must be a positive number only')

Answer 1

如果你想让你的循环一直运行直到你收到一个正整数，你可以只测试输入的负整数/非数字值，然后继续下一次迭代。否则你可以从循环中跳出

while True:
    home_price = input('Enter the price of your dream house: ')

    if not home_price.isdigit() or not int(home_price) > 0:
        print('House price must be a positive integer only')
        continue

    print('The price of your dream house is: %s' % home_price)
    break

Enter the price of your dream house: a
House price must be a positive integer only
Enter the price of your dream house: -1
House price must be a positive integer only
Enter the price of your dream house: 1000
The price of your dream house is: 1000