問題一：安裝 MySQL-python 提示：ImportError: libmysqlclient.so.20: cannot open shared object file: No such file or directory
問題二：運行django已安裝了mysqlclient，卻依然報錯：
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?
如上原因都是因為libmysqlclient.so.20文件找不到，多半是安裝mysql文件目錄自定義所致，解決辦法：
find / -name libmysqlclient.so.20
返回：/usr/local/mysql-5.7.18-linux-glibc2.5-x86_64/lib/libmysqlclient.so.20
做個軟連，問題即可解決：
ln -s /usr/local/mysql-5.7.18-linux-glibc2.5-x86_64/lib/libmysqlclient.so.20 /usr/lib64/libmysqlclient.so.20