start_date = datetime.strptime(start_date, '%Y-%m-%d')
end_date = datetime.strptime(send_date, '%Y-%m-%d')

step = timedelta(days=1)
while start_date <= end_date:
    for day in days:
        if day == calendar.day_name[start_date.date().weekday()]:
            print calendar.day_name[start_date.date()]
        start_date += step