gistfile1.py

 from IntervalTree import IntervalTree

 class ScheduleItem:
     def __init__(self, course_number, start_time, end_time):
         self.course_number = course_number
         self.start_time = start_time
         self.end_time = end_time
     def get_begin(self):
         return minutes_from_midnight(self.start_time)
     def get_end(self):
         return minutes_from_midnight(self.end_time)
     def __repr__(self):
         return ''.join(["{ScheduleItem: ", str((self.course_number, self.start_time, self.end_time)), "}"])

 T = IntervalTree([ScheduleItem(28374, "9:00AM", "10:00AM"), \
                   ScheduleItem(43564, "8:00AM", "12:00PM"), \
                   ScheduleItem(53453, "1:00PM", "2:00PM")])
 T.search(minutes_from_midnight("11:00AM"), minutes_from_midnight("1:30PM"))