word_counts

#!/usr/bin/python

from collections import Counter
import sys
import re
import gzip

def count_words(text, d=None):
    if d is None:
        d = Counter()
    words = re.findall(r"\b[a-z][a-z'-]*\b", text.lower())
    d.update(words)
    return d


def main():
    counter = Counter()
    for fn in sys.argv[1:]:
        if fn.lower().endswith('.gz'):
            f = gzip.open(fn)
        else:
            f = open(fn)
        text = f.read()
        f.close()
        count_words(text, counter)

    for x in counter.most_common():
        print "%s %s" % x

main()