ex17(更多文件操作).py

#coding:utf-8

#更多文件操作
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()