human
Solve the following python programming problem given the following code:
def _test_cleanup(self, strong_refs) : 
    "test that the pool's connections are OK after cleanup() has
        been called." 
    dbapi = MockDBAPI () 
    lock = threading.Lock () 
    def creator() : 
        with lock : 
            return dbapi.connect () 
p = pool.SingletonThreadPool (creator = creator, pool_size = 3) 
    if strong_refs : 
        sr = set () 
        def _conn() : 
            c = p.connect () 
            sr.add (c.connection) 
            return c 
else : 
        def _conn() : 
            return p.connect () 
def checkout() : 
        for x in range (10) : 
            c = _conn () 
            assert c 
            c.cursor () 
            c.close () 
            time.sleep (0.1) 
threads = [] 
    for i in range (10) : 
        th = threading.Thread (target = checkout) 
        th.start () 
        threads.append (th) 
for th in threads : 
        th.join (join_timeout) 
assert (len (p._all_conns) == 3) 
    if strong_refs : 
        still_opened = len ([c for c in sr if (not p.close.call_count)]) 
        eq_ (still_opened, 3) 

    
    

    Fix the buggy line: still_opened = len ([c for c in sr if (not p.close.call_count)])
assistant
#Here is Python code to fix the buggy line: still_opened = len ([c for c in sr if (not p.

still_opened = len ([c for c in sr if (not c.close.call_count)])