human
Solve the following python programming problem given the following code:
def test_ack() : 
    (server, session, transport, conn) = _get_test_environment () 
    transport.recv (proto.message (None, 'abc', 1)) 
    eq_ (conn.pop_incoming (), 'abc') 
    eq_ (transport.pop_outgoing (), '3:::abc') 
    eq_ (transport.pop_outgoing (), '6:::1') 
    def handler(msg, data) : 
        eq_ (msg, 'abc') 
        eq_ (data, None) 
        conn.send ('yes') 
conn.send ('abc', session) 
    eq_ (transport.pop_outgoing (), '3:1::abc') 
    transport.recv ('6:::1') 
    eq_ (transport.pop_outgoing (), '3:::yes') 
    transport.recv (proto.event (None, 'test', 1, a = 10, b = 20)) 
    eq_ (transport.pop_outgoing (), proto.event (None, 'test', None, a = 10, b = 20)) 
    eq_ (transport.pop_outgoing (), proto.ack (None, 1, 'test')) 

    
    

    Fix the buggy line: conn.send ('abc', session)
assistant
#Here is Python program to fix the buggy line: conn.

conn.send ('abc', def handler()