addCleanup(function, *args, **kwargs)?
Add a function to be called after tearDown() to cleanup resources used during the test. Functions will be called in reverse order to the order they are added (LIFO). They are called with any arguments and keyword arguments passed into addCleanup() when they are added.

If setUp() fails, meaning that tearDown() is not called, then any cleanup functions added will still be called.

New in version 2.7.

添加针对每个测试用例执行完tearDown()方法之后的清理方法，添加进去的函数按照后进先出（LIFO）的顺序执行，要加参数进去
当然，如果setUp()方法执行失败，那么不会执行tearDown()方法，自然也不会执行addCleanup()里添加的函数。

#coding:utf-8
‘‘‘
Created on 2016年8月31日
@author: huzq
‘‘‘
import unittest

class my(unittest.TestCase):
    
    def delf(self,a):
        print a
    
    def setUp(self):
        print "setUp"

        
    def test_1(self):
        ‘‘‘i dont konw‘‘‘
        a=‘1111‘
        print "test_1"       
        cleanups = (‘bbbbb‘,)
        self.addCleanup(self.delf,
                        cleanups [0])
        
    def tearDown(self):
        print ‘this is tearDown‘
        
    #def doCleanups(self):
     #   print "this is cleanups"
    
    def test_2(self):
        print "test_2"
    
    @classmethod
    def tearDownClass(cls):
        print "teardown...."
        
if __name__=="__main__":
    test=unittest.TestSuite()
    test.addTest(my(‘test_1‘))
    test.addTest(my(‘test_2‘))
    runner=unittest.TextTestRunner()
    runner.run(test)

..
----------------------------------------------------------------------
Ran 2 tests in 0.000s

OK
setUp
test_1
this is tearDown
bbbbb
setUp
test_2
this is tearDown
teardown....