read运行

#_*_ coding:utf-8 _*_

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()#注意这里假如改短的话，改成indata = open(from_file).read()

此时结尾的in_field.close()就不再需要了，因为read一旦运行，文件就会被python 关闭

 

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()