1. ubuntu 下如何查询子集的mysql版本：
方法一：
登录子集的mysql之后就会显示mysql版本；
***:~$ mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 40
Server version: 5.5.41-0ubuntu0.14.10.1 (Ubuntu) #这就是版本号 Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement
方法二：
在你登录之后输入查询语句：select version();
mysql> select version();
+-------------------------+
| version() |
+-------------------------+
| 5.5.41-0ubuntu0.14.10.1 |
+-------------------------+
1 row in set (0.00 sec) mysql>
就是这么简单；
2.ubuntu下如何知道自己python的版本号：
直接运行'python'就可以查看子集的python版本号；
***:~$ python
Python 2.7.8 (default, Oct 20 2014, 15:05:19)
[GCC 4.9.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
3.ubuntu下如何查询自己的django版本号：
首先，在python下导入django包；
import django
然后，运行django.VERSION
>>> import django
>>> django.VERSION
(1, 5, 8, 'final', 0)
>>>