Python:读文件和写文件

luoson1

　　1. 写文件
#! /usr/bin/python3'makeTextFile.py -- create text file'import osdef write_file():"used to write a text file."ls = os.linesep#get filenamefname = input("Please input filename:")while True:if os.path.exists(fname):print("Error: '%s' already exists" % fname)fname = input("Please input filename:")else:break#get file conent linesOnScreenall = []print("\nEnter lines ('.' to quit).\n")while True:entry = input('>')if entry == '.':breakelse:all.append(entry)try:fobj = open(fname,  'w')except IOError as err:print('file open error: {0}'.format(err))  fobj.writelines(['%s%s' % (x,  ls) for x in all])fobj.close()print('WRITE FILE DONE!')return fname　　
2. 读文件
#! /usr/bin/python3'readTextFile.py -- read and display text file.'def read_file(filename):'used to read a text file.'try:fobj = open(filename,  'r')except IOError as err:print('file open error: {0}'.format(err))  else:for eachLine in fobj:print(eachLine)fobj.close()　　
3. 主程序
#! /usr/bin/python3'write_and_read_file.py -- write and read text file.'import makeTextFileimport readTextFileif __name__ == '__main__':#wrie filefilename = makeTextFile.write_file()#read filereadTextFile.read_file(filename)　　
4.运行结果
Python 3.2.2 (default, Sep  4 2011, 09:51:08) [MSC v.1500 32 bit (Intel)] on winxp-duanyx, Standard>>> Please input filename:d:\testpython.logEnter lines ('.' to quit).>this is a test file.>ok ,let us input . to end the content input.>.WRITE FILE DONE!this is a test file.ok ,let us input . to end the content input.>>>