(self, year, month)
return (
            self.during(year, month)
            .filter(paid=True)
            .aggregate(
                total_amount=models.Sum("amount"),
                total_refunded=models.Sum("amount_refunded"),
            )
        )
Return paid Charges during a certain year, month with total amount,
        fee and refunded annotated.
Return paid Charges during a certain year, month with total amount,
        fee and refunded annotated.
Return paid Charges during a certain year month with total amount fee and refunded annotated .
def paid_totals_for(self, year, month):
        """
        Return paid Charges during a certain year, month with total amount,
        fee and refunded annotated.
        """
        return (
            self.during(year, month)
            .filter(paid=True)
            .aggregate(
                total_amount=models.Sum("amount"),
                total_refunded=models.Sum("amount_refunded"),
            )
        )
def paid_totals_for ( self , year , month ) : return ( self . during ( year , month ) . filter ( paid = True ) . aggregate ( total_amount = models . Sum ( "amount" ) , total_refunded = models . Sum ( "amount_refunded" ) , ) )