use python to edit pdf document

[nillgump]

hi all.
I  are looking for some packages which use python to edit pdf format
docutment.
when I searched the internet,I found  the
paper  " Using Python as PDF Editing and Processing Framework"  which
is at:
*********http://www.python.org/workshops/2002-02/papers/17/
index.htm*********
this paper is posted at  2002.it  had a  long  years.But I cann't
find  the impletation.
Does anyone know what  happened  about
this?And  I  have seen the Reportlab  which can generate the pdf .But
what I  want is not only this,but also can edit the pdf.
So does  everyone know there  are some
exsiting python packages about this?
With using the exsiting  things,I can save
much work.
Any advice is  appropriated!

--nillgump
--2009/7/3
--China