Specific question about readlines versus xreadlines

[Pernell Williams]

Hi all:



Thank you for your responses. I have a more specific question about
"file.seek() and file.readline()" versus "file.seek() and file.xreadlines".



When I have the following code:



#!/usr/bin/env python



#opening the file for reading

str = 'myShortFile'

file = open(str, 'r')

counter = 0

#outer loop using file.readline



while 1:

  line = file.readline()

  if line == '':

    break

  data = line

  print data

  file.seek(12)

# end while



And the input file is:

 abc

 def

 ghi



The above code with the readline statement is:

abc



In other words, the code reads the first line of the file, goes to position
12 (which is the end of the last line of the file), and then during the
second iteration of the while loop, the position of the file is at 12.



Now, with xreadlines(), it is a different story. I have this code:



#!/usr/bin/env python



#opening the file for reading

str = 'myShortFile'

file = open(str, 'r')

counter = 0



#outer loop using file.xreadlines



for line in file.xreadlines():

  data = line

  print data

  file.seek(12)

# end while



and if I have the same input file as above, I get this output:



abc



def



ghi



In other words, even though I have the "file.seek(12)" statement in the
loop, the position is NOT changed to 12 during the 2nd iteration of the
while loop.



Is there ANYTHING I can do in this "xreadlines()" loop to make it go to
position 12 in the second iteration?



Thanks for your help!



-Pernell




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