try:
			Batch.create_table()
		except peewee.OperationError:
			pass

		try:
			User.create_table()
		except peewee.OperationError:
			pass

		try:
			Student.create_table()
		except peewee.OperationError:
			pass
		try:
			Exercise.create_table()
		except peewee.OperationError:
			pass				
	elif sys.argv[1] == 'print':
		if len(sys.argv) >= 3:
			if sys.argv[2] == 'school':
				for school in School.select():	
					print school
			elif sys.argv[2] == 'batch':
				for batch in Batch.select():
					print batch
			elif sys.argv[2] == 'user':
				for user in User.select():
					print user
			elif sys.argv[2] == 'student':
				for student in Student.select():