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From: Peter Otten <__peter__@web.de>
Subject: Re: fseek In Compressed Files
Date: Thu, 30 Jan 2014 12:28:32 +0100
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Xref: csiph.com comp.lang.python:64980

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)?