python:习题17

# -*- coding: cp936 -*-
from sys import argv
from os.path import exists

script, from_file, to_file = argv

print "Copying from %s to %s" % (from_file, to_file)

# we could do these two on one line too, how?

in_file = open (from_file)
indata = in_file.read()

print "The input file is %d bytes long" % len(indata)

print "Does the output file exist? %r" % exists(to_file)

print "Ready, hit RETURN to continue , CTRL-C to abort."
raw_input()

out_file = open(to_file, 'w')
out_file.write(indata)

#print "Alright, all done."

out_file.close()
in_file.close()

#改成一行
open(to_file, 'w').write(open(from_file).read())