Python 读写文件

简单的实例：

写输入内容到创建的文件中：

import os

ls = os.linesep     #Win is '\r\n' and Linux is '\n'

fileName = raw_input('Please enter your file name here:')



while True:

    if os.path.exists(fileName):

        print 'The file "%s" has already existed' %fileName

        exit(0)

    else:

        break



print "Enter what you can type here:"



lines = list()  #Create an empty list

#lines = []

while True:

    inputLine = raw_input('>')

    if inputLine == ' ':

        break

    else:

        lines.append(inputLine)



fileHandler = open(fileName, 'w')

fileHandler.writelines('%s%s' %(n, ls) for n in lines)

fileHandler.close()

print 'Write succeed!!'

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读指定文件的内容：

 1 import os

 2 fileName = raw_input('Please your file name:')

 3 print '***Begin to read file.'

 4 try:

 5     fileHandler = open(fileName, 'r')

 6 except IOError, e:

 7     print "*** Open file failed:", e

 8 else:

 9     for line in fileHandler:

10         print line,                 #Notice the comma

11 finally:

12     print '***Begin to close file.'

13 fileHandler.close()

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