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import sys
# generally, Counter from the standard library would be more appropriate
def count_words(filename, n):
counts = {}
with open(filename) as f:
line = f.readline()
# defaultdict here
while line != "":
words = (w.strip() for w in line.split())
for w in words:
c = counts.get(w, 0)
counts[w] = c + 1
line = f.readline()
# bisect here, or just sort the dictionary by counts
champions, min_count = [], 0
for word, count in counts.iteritems():
if count > min_count:
i = 0
for i, pair in enumerate(champions):
if pair[1] < count:
champions[i:i] = [(word, count)]
if len(champions) > n:
champions = champions[:n]
min_count = champions[-1][1]
return champions
if __name__ == '__main__':
if len(sys.argv) != 3:
print "Usage: {0} <filename> <n>.".format(sys.argv[0])
for result in count_words(sys.argv[1], int(sys.argv[2])):
print "{0}\t{1}".format(*result)
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