django目前支持三种MySQL驱动来进行mysql的链接
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MySQLdb is a native driver that has been developed and supported for over a decade by Andy Dustman.
mysqlclient is a fork of MySQLdb which notably supports Python 3 and
can be used as a drop-in replacement for MySQLdb. At the time of this writing,
this is the recommended choicefor using MySQL with Django.
MySQL Connector/Python is a pure Python driver from Oracle that does not require the MySQL client library or any Python modules outside the standard library.
mysqldb 目前不支持python3+，推荐使用mysqlclient
尝试了在pycharm上直接安装mysqlclient，报以下错误：OSError: mysql_config not found
在git上查阅安装步骤：
You may need to install the Python and MySQL development headers and libraries like so:
sudo apt-get install python-dev libmysqlclient-dev # Debian / Ubuntu
sudo yum install python-devel mysql-devel # Red Hat / CentOS
On Windows, there are binary wheel you can install without MySQLConnector/C or MSVC.
sudo apt-get install python3-dev # debian / Ubuntu
sudo yum install python3-devel # Red Hat / CentOS
brew install mysql-connector-c # macOS (Homebrew)
pip install mysqlclient
因为我在mac上，使用的python3，故先执行命令：
brew install mysql-connector-c
然后再执行：
pip3 install mysqlclient
报如下错误：
Command "python setup.py egg_info" failed with error code 1 in /private/tmp/pip-build-m9v70gan/mysqlclient/
这个地方有点疑惑：使用pip3命令后，最终调用的是python，而不是python3
查看mysqlclient的源代码，发现根本原因还是因为没找到mysql_config，明白过来需要安装mysql，才能正常安装mysqlclient
Installed /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/mysqlclient-1.3.10-py3.6-macosx-10.6-intel.egg
Processing dependencies for mysqlclient==1.3.10
Finished processing dependencies for mysqlclient==1.3.10
