Rooms and timetable problem

timetable.py

timetable = (
    ('10:30', '11:30'),
    ('10:00', '11:00'),
    ('11:00', '12:00'),
    ('09:33', '12:00'),
    ('17:00', '19:00'),
    ('17:00', '19:00'),
    ('17:00', '19:00'),
    ('17:00', '19:00'),
)

def normalize_timetable(timetable):
    converted_timetable = convert_timetable(timetable)
    normalized_timetable = sort_timetable(converted_timetable)
    return normalized_timetable


def convert_timetable(timetable):
    converted_timetable = []
    for start_time, end_time in timetable:
        start_hours, start_minutes = start_time.split(':')
        start_in_minutes = int(start_hours)*60 + int(start_minutes)

        end_hours, end_minutes = end_time.split(':')
        end_in_minutes = int(end_hours)*60 + int(end_minutes)
        converted_timetable.append((start_in_minutes, end_in_minutes))

    return converted_timetable

def get_max_simultaneous_meetings(timetable):
    max_rooms_occupied = 1  # At least one room need to be present
    for index, meeting in enumerate(timetable):
        previous_meetings = timetable[:index]
        rooms_occupied = 1
        current_start_time, _ = meeting
        for prev_meeting in previous_meetings:
            _, prev_end_time = prev_meeting
            if current_start_time < prev_end_time:
                rooms_occupied += 1
        if rooms_occupied > max_rooms_occupied:
            max_rooms_occupied = rooms_occupied
    return max_rooms_occupied


def sort_timetable(timetable):
    # Specify sorting key explicitly besides it is not neccessary
    return sorted(timetable, key=lambda x: x[0])


if __name__ == '__main__':
    #print(convert_timetable(timetable))
    nt = normalize_timetable(timetable)
    print(get_max_simultaneous_meetings(nt))