Python learning 17: Using Python to copy text files

Write a Python script that copies the contents of one file to another

# -- coding: utf-8 --from sys import argvfrom os.path import existsscript, from_file, to_file = argvprint "Copying from %s to %s " % (from_file, to_file)# we could do these two on one line too, how?# input = open(from_file)# indata = input.read()indata = open(from_file).read()#print "Here is indata: %r" % indata#print#print indataprint "The input file is %d bytes long" % len(indata)print "Does the output file exists? %r" % exists(to_file)print "Ready, hit RETURN to continue, CTRL-C to abort."raw_input("RETURN or CTRL-C > ")# 如果to_file不存在的话，程序会自动在脚本当前目录创建文件，文件名为你给的第二个参数output = open(to_file, ‘w‘)output.write(indata)print "Alright, all done."output.close()printprint indata

Overwrite the code using the Import entire module:

import sys #导入sys模块，可以读写文件内容import os  #导入os模块，可以使用exists方法查询文件是否存在script, from_file, to_file = sys.argvinput = open(from_file)indata = input.read()print "Does the output file exists? %r" % os.path.exists(to_file)raw_input("continue? ‘RETURN‘ for continue, ‘CTRL-C‘ for abort. >")output = open(to_file, ‘w‘)output.write(indata)print "Alright, done."output.close()input.close()

Python learning 17: Using Python to copy text files