new_contents: from pulp import *
  from datetime import datetime
  
  
  # Create model
  m = LpProblem("Classroom Scheduler", 0)
  
  blocks = [str(datetime(2012, 1, 1, hr, min, 0).time()) for hr in range(0,24) for min in range(0,60,5)]
  
  print(blocks)
  
  class Block:
      def __init__(self, start_dtm):
          self.start_dtm = start_dtm
  
  
subject: Create ClassroomScheduler.py