安装mysqlclient出错

MySQLdb不支持Python3，所以Django连接MySQL不能使用MySQLdb，需要mysqlclient。
使用pip安装:

$ pip install mysqlclient

结果报错如下：

Collecting mysqlclient                                                                                                                                                                                             
  Using cached https://files.pythonhosted.org/packages/4d/38/c5f8bac9c50f3042c8f05615f84206f77f03db79781db841898fde1bb284/mysqlclient-1.4.4.tar.gz                                                                 
    ERROR: Command errored out with exit status 1:                                                                                                                                                                 
     command: /home/starx/pythonvirtualenv/bbs_py37/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-sjupbyog/mysqlclient/setup.py'"'"'; __fil                                
e__='"'"'/tmp/pip-install-sjupbyog/mysqlclient/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec                                
(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base pip-egg-info                                                                                                                                        
         cwd: /tmp/pip-install-sjupbyog/mysqlclient/                                                                                                                                                               
    Complete output (12 lines):                                                                                                                                                                                    
    /bin/sh: 1: mysql_config: not found                                                                                                                                                                            
    /bin/sh: 1: mariadb_config: not found                                                                                                                                                                          
    /bin/sh: 1: mysql_config: not found                                                                                                                                                                            
    Traceback (most recent call last):                                                                                                                                                                             
      File "", line 1, in                                                                                                                                                                          
      File "/tmp/pip-install-sjupbyog/mysqlclient/setup.py", line 16, in                                                                                                                                   
        metadata, options = get_config()                                                                                                                                                                           
      File "/tmp/pip-install-sjupbyog/mysqlclient/setup_posix.py", line 61, in get_config                                                                                                                          
        libs = mysql_config("libs")                                                                                                                                                                                
      File "/tmp/pip-install-sjupbyog/mysqlclient/setup_posix.py", line 29, in mysql_config                                                                                                                        
        raise EnvironmentError("%s not found" % (_mysql_config_path,))                                                                                                                                             
    OSError: mysql_config not found                                                                                                                                                                                
    ----------------------------------------                                                                                                                                                                       
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

根据mysqlclient的官方文档，在安装前需要先安装一些依赖：

sudo apt-get install python-dev default-libmysqlclient-dev

Python3用户还需要安装python3-dev，关于python3-dev的解释

sudo apt-get install python3-dev

之后再安装mysqlclient：

$ pip install mysqlclient

成功按照并可以runserver了。