[Zope] Return data from python

I am new to Zope and Python. I want to be able to return the results of calculations from a python script. The script gathers 3 bits of information from a database using 3 queries. I want to add up the 3 numbers and return to the calling DTML the 4 numbers. What is the best way to do this. Also as a side note... These numbers are dollar amounts. I have not found a way to format them in Python. Can you offer any suggestions. Thanks Gene