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问题一：安装 MySQL-python 提示：ImportError: libmysqlclient.so.20: cannot open shared object file: No such file or directory
问题二：运行django已安装了mysqlclient，却依然报错：
django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: libmysqlclient.so.20: cannot open shared object file: No such file or directory.
Did you install mysqlclient or MySQL-python?
如上原因都是因为libmysqlclient.so.20文件找不到，多半是安装mysql文件目录自定义所致，解决办法：
find / -name libmysqlclient.so.20
返回：/usr/local/mysql-5.7.18/lib/libmysqlclient.so.20
做个软连，问题即可解决：
ln -s /usr/local/mysql-5.7.18/lib/libmysqlclient.so.20 /usr/lib64/libmysqlclient.so.20lddconfig