Meeting Calendar problem with sets

meeting.py

timeline = {
		 '1': set([0,1,2,3,4]),
         '2': set([3,4,5,6,7]),
         '3': set([2,3,4])}

def get_meeting_time(timeline):

	"""
		get intersection of all the person
	"""
	res = set([0,1,2,3,4,5,6,7,8,9])
	maxres = set()
	for x in timeline:
		y = set(timeline[x])
		res = y & res
		if len(res) != 0:
			maxres = res
	print maxres

get_meeting_time(timeline)