stripping fields from xml file into a csv

[Hal Styli]

Hello,

Can someone please help.
I have a sed solution to the problems below but would like to rewrite
in python...

I need to strip out some data from a quirky xml file into a csv:

from something like this

< ..... cust="dick" .... product="eggs" ... quantity="12" .... >
< .... cust="tom" .... product="milk" ... quantity="2" ...>
< .... cust="harry" .... product="bread" ... quantity="1" ...>
< .... cust="tom" .... product="eggs" ... quantity="6" ...>
< ..... cust="dick" .... product="eggs" ... quantity="6" .... >

to this

dick,eggs,12
tom,milk,2
harry,bread,1
tom,eggs,6
dick,eggs,6

I am new to python and xml and it would be great to see some slick
ways of achieving the above by using python's XML capabilities to
parse the original file or python's regex to achive what I did using
sed.

Thanks for any constructive help given.

Hal