human
Solve the following python programming problem given the following code:
@ unittest.skipUnless (hasattr (select, 'poll'), 'select.poll required') 
def test_readwrite(self) : 
    attributes = ('read', 'expt', 'write', 'closed', 'error_handled') 
    expected = ((select.POLLIN, 'read'), (select.POLLPRI, 'expt'), (select.POLLOUT, 'write'), (select.POLLERR, 'closed'), (select.POLLHUP, 'closed'), (select.POLLNVAL, 'closed')) 
    class testobj () : 
        def __init__(self) : 
            self.read = False 
            self.write = False 
            self.closed = False 
            self.expt = False 
            self.error_handled = False 
def handle_read_event(self) : 
            self.read = True 
def handle_write_event(self) : 
            self.write = True 
def handle_close(self) : 
            self.closed = True 
def handle_expt_event(self) : 
            self.expt = True 
def handle_error(self) : 
            self.error_handled = True 
for (flag, expectedattr) in expected : 
        tobj = testobj () 
        self.assertEqual (getattr (tobj, expectedattr), False) 
        asyncore.readwrite (tobj, flag) 
        for attr in attributes : 
            self.assertEqual (getattr (tobj, attr), (attr == expectedattr)) 
tr1 = exitingdummy () 
        self.assertRaises (asyncore.ExitNow, asyncore.readwrite, tr1, flag) 
        tr2 = crashingdummy () 
        self.assertEqual (tr2.error_handled, False) 
        asyncore.readwrite (tr2, tr1) 
        self.assertEqual (tr2.error_handled, True) 

    
    

    Fix the buggy line: asyncore.readwrite (tr2, tr1)
assistant
#Here is Python code to fix the buggy line: asyncore.

asyncore.readwrite (tr2, flag)