<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_last_week_range(weekday_start="Sunday"):
 """ Gets the date for the first and the last day of the previous complete week. :param weekday_start: Either "Monday" or "Sunday", indicating the first day of the week. :returns: A tuple containing two date objects, for the first and the last day of the week respectively. """

    today = date.today()
    # Get the first day of the past complete week.
    start_of_week = snap_to_beginning_of_week(today, weekday_start) - timedelta(weeks=1)
    end_of_week = start_of_week + timedelta(days=6)
    return (start_of_week, end_of_week)