使用pip3安装mysqlclient的时候，提示如下异常：

$ pip3 install mysqlclient

提示如下：

Collecting mysqlclient
Using cached https://files.pythonhosted.org/packages/f4/f1/3bb6f64ca7a429729413e6556b7ba5976df06019a5245a43d36032f1061e/mysqlclient-1.4.2.post1.tar.gz
ERROR: Complete output from command python setup.py egg_info:
ERROR: /bin/sh: mysql_config: command not found
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/private/var/folders/fp/8rndwmss5nxdqwwkhsgxdpv40000gn/T/pip-install-h8mpixhz/mysqlclient/setup.py", line 16, in <module>
metadata, options = get_config()
File "/private/var/folders/fp/8rndwmss5nxdqwwkhsgxdpv40000gn/T/pip-install-h8mpixhz/mysqlclient/setup_posix.py", line 51, in get_config
libs = mysql_config("libs")
File "/private/var/folders/fp/8rndwmss5nxdqwwkhsgxdpv40000gn/T/pip-install-h8mpixhz/mysqlclient/setup_posix.py", line 29, in mysql_config
raise EnvironmentError("%s not found" % (_mysql_config_path,))
OSError: mysql_config not found
----------------------------------------
ERROR: Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/fp/8rndwmss5nxdqwwkhsgxdpv40000gn/T/pip-install-h8mpixhz/mysqlclient/

解决方法：

1、如果电脑没有安装brew，按照以下方式安装brew，再安装mysql-connector-c：

$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

2、安装mysql-connector-c：

$ brew install mysql-connector-c

3、重新安装：

$ pip3 install mysqlclient

然后还有如下异常：

Looking in indexes: http://pypi.douban.com/simple/
Collecting mysqlclient
  Downloading http://pypi.doubanio.com/packages/f4/f1/3bb6f64ca7a429729413e6556b7ba5976df06019a5245a43d36032f1061e/mysqlclient-1.4.2.post1.tar.gz (85kB)
     |████████████████████████████████| 92kB 2.3MB/s 
    ERROR: Complete output from command python setup.py egg_info:
    ERROR: Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/var/folders/fp/8rndwmss5nxdqwwkhsgxdpv40000gn/T/pip-install-ch66eofs/mysqlclient/setup.py", line 16, in <module>
        metadata, options = get_config()
      File "/private/var/folders/fp/8rndwmss5nxdqwwkhsgxdpv40000gn/T/pip-install-ch66eofs/mysqlclient/setup_posix.py", line 53, in get_config
        libraries = [dequote(i[2:]) for i in libs if i.startswith('-l')]
      File "/private/var/folders/fp/8rndwmss5nxdqwwkhsgxdpv40000gn/T/pip-install-ch66eofs/mysqlclient/setup_posix.py", line 53, in <listcomp>
        libraries = [dequote(i[2:]) for i in libs if i.startswith('-l')]
      File "/private/var/folders/fp/8rndwmss5nxdqwwkhsgxdpv40000gn/T/pip-install-ch66eofs/mysqlclient/setup_posix.py", line 12, in dequote
        raise Exception("Wrong MySQL configuration: maybe https://bugs.mysql.com/bug.php?id=86971 ?")
    Exception: Wrong MySQL configuration: maybe https://bugs.mysql.com/bug.php?id=86971 ?
    ----------------------------------------
ERROR: Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/fp/8rndwmss5nxdqwwkhsgxdpv40000gn/T/pip-install-ch66eofs/mysqlclient/

4、编辑mysql_config配置文件：

$ vim  /usr/local/Cellar/mysql-connector-c/6.1.11/bin/mysql_config

找到：

libs="$libs -l "  

替换成：

libs="$libs -lmysqlclient -lssl -lcrypto"  

保存后再次尝试，即可正确安装。