Python 中对文件的输入输出

 #! /usr/bin/python
 # Filename:using_file.py

 poem = '''\
 Programming is fun
 When the work is done
 if you wanna make your work also fun:
     use Pyhon!
 '''

 f = file('poem.txt', 'w') # open for 'w'riting
 f.write(poem) # write text to file
 f.close() # close the file

 f = file('poem.txt')
 # if no mode is sepecified, 'r'ead mode is assumed by default
 while True:
     line = f.readline()
     if len(line) == 0: # zero length indecates eof
         break
     print line,
     # notice comma to avoid automatic newline added by python

 f.close() # close the file