【笨方法学python】ex17 - 更多文件操作

代码如下：

点击查看代码

# -*-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"

点击查看代码

123456

------------

执行结果：