当我运行以下脚本时：

import MySQLdb

conn = MySQLdb.connect (host = 'localhost',
   user = 'erin',
   passwd = 'erin',
          db = 'sec')

我得到错误：

File "/Library/Python/2.6/site-packages/MySQL_python-1.2.3-py2.6-macosx-10.6-universal.egg/MySQLdb/__init__.py", line 81, in Connect
    return Connection(*args, **kwargs)
  File "/Library/Python/2.6/site-packages/MySQL_python-1.2.3-py2.6-macosx-10.6-universal.egg/MySQLdb/connections.py", line 187, in __init__
    super(Connection, self).__init__(*args, **kwargs2)
_mysql_exceptions.OperationalError: (2002, "Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)")

在那个目录中没有名为mysql.sock的文件，但我不知道套接字是什么，也不知道如何使用MySQLdb模块为它指定正确的位置。