Finding installed packages and their repositories using python yum module

Hi,
I am using python yum module.
I am finding all installed packages in system and yum repositories, from
which these RPMs
are installed.
From command line, I can see this using command:

$yum list installed

However when I am using python yum module, I can find the installed
packages but
I am not able to find associated yum repository from which a package is
installed.

Here is how I got the installed packages:


import yum

yb = yum.YumBase()
pkg_list = yb.doPackageLists(pkgnarrow="installed")
inst_pkg_list = pkg_list.installed

#Now I am trying to find if there is an attribute giving yum repository
info for this package
rpm1 = inst_pkg_list[0]
rpm1.repoid
'installed'
#However, it returns 'installed', which is not yum repository name.


Where I am doing it wrong?
Any help is highly appreciated.

-- 
Regards,
Navid Shaikh

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