deleted guest = guests.pop(len(guests)-1) guests.insert(2,deleted_guest) del(guests[1]) print(deleted guest) print(guests)

As an AI language model, I cannot execute the code you provided, but I can explain what it does.

This code performs the following actions:

1. Deletes the last guest from a list of guests using the `pop()` method and assigns it to a variable called `deleted_guest`.
2. Inserts the `deleted_guest` variable at index 2 in the list using the `insert()` method.
3. Deletes the guest at index 1 from the list using the `del` keyword.
4. Prints the `deleted_guest` variable.
5. Prints the updated list of guests.

Overall, this code is manipulating a list of guests by removing one guest, inserting it at a different index, and deleting another guest.

相关问题

SELECT s.student_num, s.student_name, '计算机学院' AS college_name, c.level, c.class_name FROM student_info s JOIN classes c ON s.class_id = c.id JOIN volunteer_time_table_item t ON s.student_num = t.student_num INNER JOIN student_info s ON c.id = s.college_id INNER JOIN volunteer_time_table_item t ON s.student_num = t.student_num INNER JOIN volunteer_time_table vtt ON vtt.id = t.volunteer_time_table_id WHERE c.college_id = 1 AND s.level = 2021 AND vtt.volunteer_status = 5 AND vtt.deleted = 0 AND t.deleted = 0 AND s.deleted = 0 AND c.deleted = 0 ORDER BY t.volunteer_time_value DESC LIMIT 5;哪里有问题

这个 SQL 查询语句有以下问题：

1. 语法错误：在SELECT语句中，没有为 '计算机学院' 添加引号，应该在前后添加单引号。

2. 重复声明表别名：在JOIN语句中，重复声明了表别名 s 和 t，应该将它们改成不同的别名。

3. 错误的表连接方式：在JOIN语句中，没有为 student_info 表声明别名，应该将其改为 s 或其他合适的别名。此外，使用 INNER JOIN 连接 volunteer_time_table_item 表和 student_info 表时，应该使用 ON 关键字指定连接条件。

4. SELECT语句中重复声明列名：在SELECT语句中，声明了 student_num, student_name, level, class_name 列名，但是其中的 level 和 class_name 列名已经在 JOIN 语句中声明过了，应该删除重复的声明。

5. 语法错误：在 ORDER BY 语句中，应该为 t.volunteer_time_value 添加列名，否则会报 Unknown column 'volunteer_time_value' in 'order clause' 的错误。

修改后的 SQL 查询语句如下：

SELECT s.student_num, s.student_name, '计算机学院' AS college_name, c.level, c.class_name
FROM student_info s
JOIN classes c ON s.class_id = c.id
JOIN volunteer_time_table_item t ON s.student_num = t.student_num
INNER JOIN student_info si ON c.id = si.college_id
INNER JOIN volunteer_time_table_item ti ON si.student_num = ti.student_num
INNER JOIN volunteer_time_table vtt ON vtt.id = ti.volunteer_time_table_id
WHERE c.college_id = 1
AND s.level = 2021
AND vtt.volunteer_status = 5
AND vtt.deleted = 0
AND ti.deleted = 0
AND si.deleted = 0
AND c.deleted = 0
ORDER BY ti.volunteer_time_value DESC LIMIT 5;

SELECT DISTINCT s.student_num, s.student_name, '计算机学院' AS college_name, c.class_name, FROM student_info s JOIN classes c ON s.college_id = c.college_id JOIN volunteer_time_table_item t ON s.student_num = t.student_num JOIN volunteer_time_table vtt ON vtt.id = t.volunteer_time_table_id WHERE c.college_id = 1 AND s.level = 2021 AND t.deleted = 0 AND s.deleted = 0 AND vtt.deleted = 0 AND c.deleted = 0 ORDER BY t.volunteer_time_value DESC LIMIT 5;哪里有问题

在SELECT语句中，'计算机学院' AS college_name后面有一个逗号，应该将逗号删除，修改后的语句如下：

SELECT DISTINCT s.student_num, s.student_name, '计算机学院' AS college_name, c.class_name FROM student_info s JOIN classes c ON s.college_id = c.college_id JOIN volunteer_time_table_item t ON s.student_num = t.student_num JOIN volunteer_time_table vtt ON vtt.id = t.volunteer_time_table_id WHERE c.college_id = 1 AND s.level = 2021 AND t.deleted = 0 AND s.deleted = 0 AND vtt.deleted = 0 AND c.deleted = 0 ORDER BY t.volunteer_time_value DESC LIMIT 5;