human
Solve the following python programming problem given the following code:
def compute_daily_consumption_from_transactions(transactions, window_start, configuration = None) : 
    configuration = (configuration or ConsumptionConfiguration ()) 
    class ConsumptionPeriod (object) : 
        def __init__(self, tx) : 
            self.start = from_ts (tx.received_on) 
            self.start_soh = tx.normalized_value 
            self.end_soh = None 
            self.end = None 
            self.consumption = 0 
            self.receipts = 0 
def add(self, tx) : 
            self.consumption += tx.normalized_value 
def receipt(self, receipt) : 
            self.receipts += receipt 
def close_out(self, tx) : 
            self.end = from_ts (tx.received_on) 
            self.end_soh = tx.normalized_value 
def is_valid(self) : 
            return ((self.start_soh + Decimal (self.receipts)) >= self.end_soh) 
@ property 
        def length(self) : 
            return span_days (self.start, self.end) 
@ property 
        def normalized_length(self) : 
            return span_days (max (self.start, window_start), max (self.end, window_start)) 
@ property 
        def normalized_consumption(self) : 
            return ((float (self.consumption) * self.normalized_length) / self.length) 
def split_periods(transactions) : 
        period = None 
        for tx in transactions : 
            if tx.is_checkpoint : 
                if period : 
                    period.close_out (tx) 
                    if ((not configuration.exclude_invalid_periods) or period.is_valid ()) : 
                        (yield period) 
period = ConsumptionPeriod (tx) 
else : 
                if tx.is_stockout : 
                    if period : 
                        period = None 
else : 
                    if (tx.type == const.TRANSACTION_TYPE_CONSUMPTION) : 
                        if period : 
                            period.add (tx) 
else : 
                        if (configuration.exclude_invalid_periods and (tx.type == const.TRANSACTION_TYPE_RECEIPTS)) : 
                            if (period and...

    
    

    Fix the buggy line: return ((configuration / float (total_length)) if total_length else None)
assistant
#Here is Python code to fix the buggy line: return ((configuration / float (total_length)) if total_length else None)
.

return ((total_consumption / float (total_length)) if total_length else None)