Python file operation instance code

#! /Usr/bin/env python

01 #! /Usr/bin/env python

02 # coding: UTF-8

03 # Author: Cool

04 # Purpose: file operation class

05 # Created: 2011/1/1

06

07 # declare a string text

08 poem = '''\

09 Programming is fun Test

10 When the work is done

11 if you wanna make your work also fun:

12 use Python!

13 '''

14 # create a file instance in the read-only mode ('R'), write mode ('W'), and append mode ('A ')

15 f=file('poem.txt ', 'A') # open for 'W' riting

16 f. write (poem) # write text to the file write text to file

17 f. close () # close the file

18

19 # the default mode is read-only.

20 f=file('poem.txt ')

21 # if no mode is specified, 'R' ead mode is assumed by default

22 while True:

23 line = f. readline () # Read every row of the file

24 if len (line) = 0: # Zero length indicates EOF

25 break

26 print line, # output this line

27 # Note: because the content read from the file has ended with a line break, we use a comma in the output statement to eliminate line breaks.

28

29 # Notice comma to avoid automatic newline added by Python

30 f. close () # close the file

31

32 # Help

33 help (file)