代码如下：
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# -*-coding:utf-8- -*-
# 更多文件操作
from sys import argv
from os.path import exists
# exists 模块： 将文件名字符串作为参数，如果文件存在，返回 True
# 如果文件不存在，返回 False
script, from_file, to_file = argv
print "Copying from %s to %s" % (from_file, to_file)
# we could do these tow 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 "Dose 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()
新建文档 "ex17-1"
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执行结果：
