Delta function inside main.py

main.py

def delta(exchange, currency):
    try:
        exchange.database.begin()

        table = exchange.database[currency]

        table_length = len(table)

        date_1h = datetime.datetime.utcnow()

        date_24h = datetime.datetime.utcnow() + datetime.timedelta(-1)

        timestamp_1h = exchange.parse8601(str(date_1h)) - 3600000

        timestamp_24h = exchange.parse8601(str(date_24h))

        result_1h = table.find_one(table.table.columns.time_ms > timestamp_1h)

        result_24h = table.find_one(table.table.columns.time_ms > timestamp_24h)

        result_now = table.find_one(id=table_length)

        closing_now = result_now['close']

        # CHECK IF THE VALUES ARE NONE TYPE OR NOT.
        if not result_1h:
            print("none value for result_1h")
            delta_1h = 0
        else:
            closing_1h = result_1h['close']
            delta_1h = ((closing_now - closing_1h) / closing_now) * 100

        if not result_24h:
            print("none value for result_24h")
            delta_24h = 0
        else:
            closing_24h = result_24h['close']
            delta_24h = ((closing_now - closing_24h) / closing_now) * 100

        exchange.database.commit()
    except Exception as error:
        print("Error in Delta function: " + str(error))
    return (delta_1h, delta_24h)