Filter Django queryset by birthdays in date range

filter_by_birthdays.py

def filter_by_birthdays(qs, from_date, to_date):

    # Build the list of month/day tuples.
    dates = []
    while from_date < to_date:
        dates.append((from_date.month, from_date.day))
        from_date += timedelta(days=1)

    # Transform each into queryset keyword args.
    dates = (dict(
        zip(('date_of_birth__month', 'date_of_birth__day'), t)) for t in dates)

    query = reduce(operator.or_, (Q(**d) for d in dates))

    return qs.filter(query)