[mod_python] Upload Progressbar for site.

Hi, I've got a working upload script on my website using the following 
method:

fileData = req.form['filename'].file.read()

and then writing fileData to the disk.

I was wondering if there is anyway to show an interactive progress bar 
or show how many bytes have been transferred. Anything to get me started 
on the right path towards a solution would be appreciated. I assume 
there may be more than just python needed to solve this.

Thanks for your time.