Question

我正在尝试创建一个功能，其中用户给出1-7的数字，该数字对应于一周中的一天，否则会有一条消息说：'抱歉这不是正确的数字'

我的代码：

def num_day():

user_number = int(input('Please enter a number between 1 & 7: '))

if user_number == 1:
    print('The number 1 corresponds to Monday')

if user_number == 2:
    print('The number 2 corresponds to Tuesday')

if user_number == 3:
    print('The number 3 corresponds to Tuesday')

if user_number == 4:
    print('The number 4 corresponds to Tuesday')

if user_number == 5:
    print('The number 5 corresponds to Tuesday')

if user_number == 6:
    print('The number 6 corresponds to Tuesday')

if user_number == 7:
    print('The number 7 corresponds to Tuesday')

else:
    print('Sorry, that is not a valid number.')


num_day()

它会使if语句正确，但继续投掷'抱歉，这不是有效数字'

Answer 1

正如评论中所提到的，这会失败，因为每个if都是它自己的逻辑语句。您想使用if..elif..else代替if..if..else。

if user_number == 1:
    print('The number 1 corresponds to Monday')

elif user_number == 2:
    print('The number 2 corresponds to Tuesday')

elif user_number == 3:
    print('The number 3 corresponds to Tuesday')

elif user_number == 4:
    print('The number 4 corresponds to Tuesday')

elif user_number == 5:
    print('The number 5 corresponds to Tuesday')

elif user_number == 6:
    print('The number 6 corresponds to Tuesday')

elif user_number == 7:
    print('The number 7 corresponds to Tuesday')

else:
    print('Sorry, that is not a valid number.')

这将它们全部合并为一个逻辑语句，然后else是所有测试的全能，而不仅仅是最后一个。

也就是说，对于像这样的初学者问题，一些过度工程总是很有趣。对于工作日数据结构，您对Enum感觉如何？

import enum

class Weekday(enum.Enum):
    MONDAY = 1
    TUESDAY = 2
    WEDNESDAY = 3
    THURSDAY = 4
    FRIDAY = 5
    SATURDAY = 6
    SUNDAY = 7

    def __str__(self):
        return self.name.title()

user_number = int(input("Enter a number: "))
try:
    weekday = Weekday(user_number)
    print(f"The number {user_number} corresponds to {weekday}")
except ValueError:
    print("Sorry, that is not a valid number.")

Answer 2

我做这样的事情：

success.user

Python无缘无故地执行else语句

2 个答案: