python mysql使用问题

(deeplearning2) userdeMBP:ageAndGender user$ python 
Python 2.7.15 |Anaconda, Inc.| (default, Dec 14 2018, 13:10:39) 
[GCC 4.2.1 Compatible Clang 4.0.1 (tags/RELEASE_401/final)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import mysql
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named mysql
>>> 
(deeplearning2) userdeMBP:ageAndGender user$ pip search mysql-connector | grep --color mysql-connector-python
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7.
mysql-connector-python (8.0.16)                           - MySQL driver written in Python
mysql-connector-python-rf (2.2.2)                         - MySQL driver written in Python
mysql-connector-python-dd (2.0.2)                         - MySQL driver written in Python
(deeplearning2) userdeMBP:ageAndGender user$ pip install mysql-connector-python-rf
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7.
Collecting mysql-connector-python-rf

当你的环境中有多个版本时，比如有python3和python2，指定在相应环境下安装包的方法是：

pip的运行方法有多种:

1.根据-m参数按照模块运行pip，方法同运行一般的py文件。

py -2 -m pip install xxx
py -3 -m pip install xxx

2.运行相应的pip程序

pip2 install xxx
pip3 install xxx

错误：

query error!(1055, u"Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'testDelDuplication.gray_list_photocode.uid' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by") 

原因：mysql新版本默认不支持group by语句

解决办法：

首先改@@GLOBAL.sql_mode：

SELECT @@GLOBAL.sql_mode;
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION 
 
set @@GLOBAL.sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';
 

然后改@@session.sql_mode：

SELECT @@session.sql_mode;
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION 
 
set @@session.sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';