title: How to walk a tar.gz file that contains zip files without extraction
body: <p>I have a large tar.gz file to analyze using a python script. The tar.gz file contains a number of zip files which might embed other .gz files in it. Before extracting the file, I would like to walk through the directory structure within the compressed files to see if certain files or directories are present. By looking at tarfile and zipfile module I don't see any existing function that allow me to get a table of content of a zip file within a tar.gz file.</p>
  
  <p>Appreciate your help,</p>