import sys
import string
#import collections
if len(sys.argv) == 1 or sys.argv[1] in {"-h", "--help"}:
print("usage: uniqueword filename_1 filename_2 ... filename_n")
sys.exit()
else:
words = {}
# words = collections.defaultdict(int)
strip = string.whitespace + string.punctuation + string.digits + "\"'"
for filename in sys.argv[1:]:
for line in open(filename):
for word in line.split():
word = word.strip(strip)
if len(word) >= 2:
words[word] = words.get(word, 0) + 1
# words[word] += 1
for word in sorted(words):
print("'{0}' occurs {1} times".format(word,words[word]))