Most common missing events in comp missing n events WCA

import csv

def missing_event(n):

	WCA_EVENTS = set("222 333 333bf 333fm 333ft 333mbf 333oh 444 444bf 555 555bf 666 777 clock minx pyram skewb sq1".split())

	with open('WCA_export_Competitions.tsv','rb') as tsvin:
		tsvin = csv.reader(tsvin, delimiter='\t')

		event_list = []
		count = []

		c = True
		C = 0

		for line in tsvin:

			if c: # skip header
				c = False
				continue

			events = set(line[10].split())
			missing_events = WCA_EVENTS - events

			if len(missing_events) == n:
				C += 1
				for x in missing_events:
					if x not in event_list:
						event_list.append(x)
						count.append(0)

					i = event_list.index(x)
					count[i] += 1

	print "Number of comps missing", n, "events:", C
	for x, y in sorted(zip(count, event_list))[::-1]:
		print str(x).zfill(3), y

missing_event(1)