find text location (in pixels) using python (pyPdf)

[Chris Curvey]

Has anyone ever tried to find the pixel (or point) location of text in
a PDF using Python?  I've been using the pyPdf libraries for other
things, and it seems to me that if I can find the bounding box for
text, I should be able to calculate the location.

What I want to do is take a PDF of one of our vendor invoices and blur
everything in it except the block that's related to a single
customer.  So if I have an invoice that looks like:

Alfred Annoying
123 Elm St
Somewhere, NJ
$100

Barbie Bonehead
456 Pine St
Elsewhere, NJ
$125

Charlie Clueless
789 Beech St.
Everywhere, NJ
$150

I want to show Barbie just her section of the invoice (with the header
intact, so that she can tell it's a real invoice) but with Alfred and
Charlie's information blurred out.  I was going to convert the PDF to
a JPG or PNG and do the blurring with ImageMagick/PythonMagick.  But
that requires me to know the pixel location of the regions that I want
blurred and left alone.

I'm also open to other ideas if I'm going about this the hard way....