Non-web-based templating system

[qscomputing at gmail.com]

Hi,

I'm creating a small application in Python that uses lists and
dictionaries to create a rudimentary database. I'd like to create some
"fill-in-the-blanks" reports from this data, ideally by taking an RTF
or plaintext file as a template and replacing placeholder tags with my
data.
Are there any good pre-written systems that would allow me to do this?

Thanks,
  - QS Computing.