Python 断言不工作 : limit user enter only stated numbers but assert not working

Question

这里是初学者。我尝试通过输入 6 个数字来创建彩票游戏。下面的代码尝试检查用户输入的数字:首先，它是否是整数；第二，是否在规定的范围内。但是，ValueError 对 int 的检查有效，但 assert 检查的数字范围无效。

def buy_lottery_ticket():
    global credit
    credit -= 5
    while True:
        try:
            entered_numbers = input('Enter your 6 favorites numbers!(1 ~ 20): ')
            entered_numbers_list = entered_numbers.split(',')
            ticket_numbers = {int(n) for n in entered_numbers_list}
            print(ticket_numbers)
            return ticket_numbers
            assert 0 < entered_numbers_list < 21
        except ValueError:
            print("Not an integer! Please enter an integer.")
        except AssertionError:
            print("Please enter an integer between 1 and 20")
        else:
            break

感谢您的投入和帮助。提前致谢。

Answer 1

您正在尝试检查 return 语句后的 6 个数字和范围值。这是执行相同操作的方法。

此外，在您的代码中，您有 credit -= 5。不确定您首先在哪里设置值。你可能想调查一下。我已经注释掉了那行代码。

def buy_lottery_ticket():
    global credit
    #credit -= 5
    while True:
        entered_numbers = input('Enter your 6 favorites numbers!(1 ~ 20): ')
        try:    
            entered_numbers_list = entered_numbers.split(',')
            ticket_numbers = {int(n) for n in entered_numbers_list}
            if len(ticket_numbers) > 6:
                print ('You must enter only 6 unique numbers')
                continue
            elif len(ticket_numbers) < 6:
                print ('You must enter at least 6 unique numbers')
                continue
            if min(ticket_numbers) < 1 or max(ticket_numbers) > 20:
                print ("Please enter an integer between 1 and 20")
                continue
            print(ticket_numbers)
            return ticket_numbers
        except ValueError:
            print("Not an integer! Please enter an integer.")

print (buy_lottery_ticket())

这个的输出将是:

Enter your 6 favorites numbers!(1 ~ 20): 5,7,15,17,3,8,9
You must enter only 6 unique numbers
Enter your 6 favorites numbers!(1 ~ 20): 5,7,15,17,3
You must enter at least 6 unique numbers
Enter your 6 favorites numbers!(1 ~ 20): 5,7,15,17,3,15
You must enter at least 6 unique numbers
Enter your 6 favorites numbers!(1 ~ 20): 5,7,15,17,3,8
{3, 5, 7, 8, 15, 17}
{3, 5, 7, 8, 15, 17}