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Groups > comp.lang.python > #65017

Re: fseek In Compressed Files

From Serhiy Storchaka <storchaka@gmail.com>
Subject Re: fseek In Compressed Files
Date 2014-01-30 17:02 +0200
References <68316d1a-e52e-48b5-87df-7119f46ebabc@googlegroups.com> <lcdcvv$lbn$2@ger.gmane.org>
Newsgroups comp.lang.python
Message-ID <mailman.6146.1391094182.18130.python-list@python.org> (permalink)

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30.01.14 13:28, Peter Otten написав(ла):
> Ayushi Dalmia wrote:
>
>> I need to randomly access a bzip2 or gzip file. How can I set the offset
>> for a line and later retreive the line from the file using the offset.
>> Pointers in this direction will help.
>
> with gzip.open(filename) as f:
>      f.seek(some_pos)
>      print(f.readline())
>      f.seek(some_pos)
>      print(f.readline())
>
> seems to work as expected. Can you tell a bit more about your usecase (if it
> isn't covered by that basic example)?

I don't recommend to seek backward in compressed file. This is very 
inefficient operation.

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Thread

fseek In Compressed Files Ayushi Dalmia <ayushidalmia2604@gmail.com> - 2014-01-30 02:50 -0800
  Re: fseek In Compressed Files Peter Otten <__peter__@web.de> - 2014-01-30 12:28 +0100
  Re:fseek In Compressed Files Dave Angel <davea@davea.name> - 2014-01-30 06:55 -0500
  Re: fseek In Compressed Files Ayushi Dalmia <ayushidalmia2604@gmail.com> - 2014-01-30 05:34 -0800
    Re: fseek In Compressed Files Chris Angelico <rosuav@gmail.com> - 2014-01-31 00:49 +1100
    Re: fseek In Compressed Files Dave Angel <davea@davea.name> - 2014-02-03 15:57 -0500
      Re: fseek In Compressed Files Ayushi Dalmia <ayushidalmia2604@gmail.com> - 2014-02-04 04:39 -0800
  Re: fseek In Compressed Files Serhiy Storchaka <storchaka@gmail.com> - 2014-01-30 17:02 +0200
  Re: fseek In Compressed Files Ayushi Dalmia <ayushidalmia2604@gmail.com> - 2014-01-30 07:37 -0800
    Re: fseek In Compressed Files Dave Angel <davea@davea.name> - 2014-01-30 13:46 -0500
      Re: fseek In Compressed Files Ayushi Dalmia <ayushidalmia2604@gmail.com> - 2014-01-31 21:52 -0800
        Re: fseek In Compressed Files Dave Angel <davea@davea.name> - 2014-02-01 04:38 -0500
  Re: fseek In Compressed Files Peter Otten <__peter__@web.de> - 2014-01-30 17:21 +0100
    Re: fseek In Compressed Files Ayushi Dalmia <ayushidalmia2604@gmail.com> - 2014-01-31 21:50 -0800
  Re: fseek In Compressed Files Serhiy Storchaka <storchaka@gmail.com> - 2014-02-03 20:32 +0200

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