把源码贴上来，希望某位大神可以指点迷津：

"""Unit test for odbchelper.py

This program is part of "Dive Into Python", a free Python book for

experienced programmers. Visit http://diveintopython.org/ for the

latest version.

"""

__author__ = "Mark Pilgrim (mark@diveintopython.org)"

__version__ = "$Revision: 1.2 $"

__date__ = "$Date: 2004/05/05 21:57:19 $"

__copyright__ = "Copyright (c) 2001 Mark Pilgrim"

__license__ = "Python"

import unittest

import odbchelper

class GoodInput(unittest.TestCase):

def testBlank(self):

"""buildConnectionString handles empty dictionary"""

self.assertEqual("", odbchelper.buildConnectionString({}))

def testKnownValue(self):

"""buildConnectionString returns known result with known input"""

params = {"server":"mpilgrim", "database":"master", "uid":"sa", "pwd":"secret"}

knownItems = params.items()

knownItems.sort()

knownString = repr(knownItems)

result = odbchelper.buildConnectionString(params)

resultItems = [tuple(e.split("=")) for e in result.split(";")]

resultItems.sort()

resultString = repr(resultItems)

self.assertEqual(knownString, resultString)

class BadInput(unittest.TestCase):

def testString(self):

"""buildConnectionString should fail with string input"""

self.assertRaises(AttributeError, odbchelper.buildConnectionString, "")

def testList(self):

"""buildConnectionString should fail with list input"""

self.assertRaises(AttributeError, odbchelper.buildConnectionString, [])

def testTuple(self):

"""buildConnectionString should fail with tuple input"""

self.assertRaises(AttributeError, odbchelper.buildConnectionString, ())

if __name__ == "__main__":

unittest.main()