mysql-python 异常

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centos5
python2.5.2
mysql-python1.2.2

import MySQLdb
import sys
db=MySQLdb.connect(user="##",passwd="##",db="##",host="######",port=3306)
cur=db.cursor(MySQLdb.cursors.Cursor)
sql="show tables"
cur.execute(sql)

执行到最后一句时，抛出异常了：
Traceback (most recent call last):
  File "", line 1, in
  File "MySQLdb/cursors.py", line 166, in execute
    self.errorhandler(self, exc, value)
  File "MySQLdb/connections.py", line 35, in defaulterrorhandler
    raise errorclass, errorvalue
SystemError: NULL object passed to Py_BuildValue


找了一天，发现这方面的资料几乎没有，不知道有人碰到过这样的情况没？[/size]