#coding:utf-8

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# 习题17:更多文件操作

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# 前言

#

# 编写一个python脚本：

# 实现复制文件

#

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) #这个文件多大

print "Does the output file exist? %r" % exists(to_file) #输出的文件是否存在

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

raw_input()

out_file = open(to_file, 'w') # 这里需要注意下写的模式下不可以读

out_file.write(indata)

print "Alright, all done."

out_file.close()

in_file.close()