def _chunk_fill_out_first_week(year, month, count, event, diff):
    """
    If a repeating chunk event exists in a particular month, but didn't
    start that month, it may be neccessary to fill out the first week.
    Five cases:
        1. event starts repeating on the 1st day of month
        2. event starts repeating past the 1st day of month
        3. event starts repeating before the 1st day of month, and continues
        through it.
        4. event starts repeating before the 1st day of month, and finishes
        repeating before it.
        5. event starts repeating before the 1st day of month, and finishes
        on it.
    """
    first_of_the_month = date(year, month, 1)
    d = _first_weekday(event.l_end_date.weekday(), first_of_the_month)
    d2 = _first_weekday(event.l_start_date.weekday(), first_of_the_month)
    diff_weekdays = d2.day - d.day
    day = first_of_the_month.day
    start = event.l_start_date.weekday()
    first = first_of_the_month.weekday()

    if start == first or diff_weekdays == diff:
        return count
    elif start > first:
        end = event.l_end_date.weekday()
        diff = end - first + 1
    elif start < first:
        diff = d.day
    for i in xrange(diff):
        if event.end_repeat is not None and \
                date(year, month, day) >= event.end_repeat:
            break
        count[day].append((event.title, event.pk))
        day += 1
    return count
dataset/ETHPy150Open wreckage/django-happenings/happenings/utils/handlers.py/_chunk_fill_out_first_week/swapped operands of `-`