Linux - python vs sh

[Krisztian Kepes]

Hi !

I want to list my rpm database to file with this:

#!/bin/sh

file="./allrpm.txt"
nr=1
for rpmname in `rpm -qa`
do
  echo '>>>>>>>>>>>>>>>' >>$file
  echo "$nr." >>$file
  echo "Name: $rpmname" >>$file
  echo "" >>$file
  info=`rpm -qi $rpmname`
  echo "$info" >>$file
  echo "" >>$file
  nr=`expr $nr + 1`
done  

But it have two error:
1. the $nr is not incremented
2. the rpm detailed info is not writed to the file

I want to change it to py code. I see an perl code:

@rpmlist= rpm -qa 
It is get the rpm's output.

But how I get the rpm's output in my py program ?
list= rpm -qa 
????

Please send me an simple example !

Thx:
 KK