转自 http://stackoverflow.com/questions/4559699/python-mysqldb-and-library-not-loaded-libmysqlclient-16-dylib
在mac os上用port 方式安装了py27-mysql，之后调用的时候有如下问题：
Traceback (most recent call last):
File "txt2db.py", line 4, in <module>
import controlMysql as cm
File "../controlMysql.py", line 4, in <module>
import MySQLdb
File "build/bdist.macosx-10.7-intel/egg/MySQLdb/__init__.py", line 19, in <module>
File "build/bdist.macosx-10.7-intel/egg/_mysql.py", line 7, in <module>
File "build/bdist.macosx-10.7-intel/egg/_mysql.py", line 6, in __bootstrap__
ImportError: dlopen(/Users/huangwaleking/.python-eggs/MySQL_python-1.2.3-py2.7-macosx-10.7-intel.egg-tmp/_mysql.so, 2): Library not loaded: libmysqlclient.18.dylib
Referenced from: /Users/huangwaleking/.python-eggs/MySQL_python-1.2.3-py2.7-macosx-10.7-intel.egg-tmp/_mysql.so
Reason: image not found
按照 stakcoverflow lukmdo 的介绍修复了问题：
Just set the DYLD_LIBRARY_PATH after
running pip or
installeasy_install:
export DYLD_LIBRARY_PATH=/usr/local/mysql/lib/
Should do the job assuming your MySQL installation lives under /usr/local/mysql.
DYLD_LIBRARY_PATH=/usr/local/mysql/lib
