python脚本： 双向统计文件字符、单词数、行数

#!/usr/bin/python

import sys

import os

if len(sys.argv) == 1:

data = sys.stdin.read()

else:

try:

fn = sys.argv[1]

except IndexError:

print "please follow a argument at %s" %__file__

sys.exit()

if not os.path.exists(fn):

print "%s is not exits." %fn

sys.exit()

fd = open(sys.argv[1])

data = fd.read()

chars = len(data)

words = len(data.split())

lines = data.count(‘\n‘)

print "%(lines)s %(words)s %(chars)s" %locals()