human
Solve the following python programming problem given the following code:
def _check_expected_balances(self) : 
    now = datetime.datetime.now () 
    balances_to_check = [] 
    try : 
        while (self.expected_balance_at_time [0] [3] < now) : 
            balances_to_check.append (self.expected_balance_at_time.popleft ()) 
except IndexError : 
        pass 
ds = [] 
    for balance_to_check in balances_to_check : 
        log.info ('Checking balance of address %s', str (balance_to_check [1])) 
        d = self._get_balance_for_address (d [1]) 
        d.addCallback ((lambda bal : (bal >= balance_to_check [2]))) 
        ds.append (d) 
dl = defer.DeferredList (ds) 
    def handle_checks(results) : 
        from future_builtins import zip 
        for (balance, (success, result)) in zip (balances_to_check, results) : 
            peer = balance [0] 
            if (success is True) : 
                if (result is False) : 
                    if (balance [4] <= 1) : 
                        new_expected_balance = (balance [0], balance [1], balance [2], (datetime.datetime.now () + self.max_expected_payment_time), (balance [4] + 1), balance [5]) 
                        self.expected_balance_at_time.append (new_expected_balance) 
                        peer.update_score ((- 5.0)) 
else : 
                        peer.update_score ((- 50.0)) 
else : 
                    if (balance [4] == 0) : 
                        peer.update_score (balance [5]) 
peer.update_stats ('points_received', balance [5]) 
else : 
                log.warning ('Something went wrong checking a balance. Peer: %s, account: %s,expected balance: %s, expected time: %s, count: %s, error: %s', str (balance [0]), str (balance [1]), str (balance [2]), str (balance [3]), str (balance [4]), str (result.getErrorMessage ())) 
dl.addCallback (handle_checks) 
    return dl 

    
    

    Fix the buggy line: d = self._get_balance_for_address (d [1])
assistant
#Here is Python code to fix the buggy line: d = self.

d = self._get_balance_for_address (balance_to_check [1])