dedup.py

def deduplicate(file1, file2):
	with open(file1,"r") as file_1:
		event_1 = file_1.read().split("\n")
	
	with open(file2,"r") as file_2:
		event_2 = file_2.read().split("\n")

	master_list = list(set(event_1 + event_2))
	
	doubles = []
	for name in master_list:
		if name in event_1 and name in event_2:
			doubles.append(name)
	
	return master_list, doubles
	
master_list, doubles = deduplicate('film_screening_attendees.txt','happy_hour_attendees.txt')

print "MASTER LIST OF ATTENDEES \n"
for index, name in enumerate(master_list):
	print "{0}. {1} \n".format(index+1, name)
	
print "ATTENDEES AT BOTH EVENTS \n"
for index, name in enumerate(doubles):
	print "{0}. {1} \n".format(index+1, name)