def average(string, days):
    if days > 300:
        days = 300
    average = data.history(context.asset, string, bar_count=int(
        days), frequency="1d").mean()

    return average


def handle_data(context, data):
    # Skip first 300 days to get full windows
    context.i += 1
    if context.i < 300:
        return

    print(data.history(context.asset, 'price', bar_count=100, frequency="1d").mean())
    average(string, days)