The gzip module  This module allows you to read and write gzip-
compressed files as if they were ordinary files.  Example: Using
the gzip module to read a compressed file # File:  import gzip
file = gzip.GzipFile("samples/sample.gz")   Well it certainly
looks as though we're in for a splendid afternoon's sport in
this the 127th Upperclass Twit of the Year Show.  The standard
implementation doesn’t support the seek and tell methods. The
following example shows how to add forward seeking:  Example:
Extending the gzip module to support seek/tell # File:  import
gzip  class gzipFile(gzip.GzipFile):     # adds seek/tell
support to GzipFile      offset = 0      def read(self,
size=None):         data =, size)         self.offset =
self.offset + len(data)         return data      def seek(self,
offset, whence=0):         # figure out new position (we can
only seek forwards)         if whence == 0:             position
= offset         elif whence == 1:             position =
self.offset + offset             raise IO