Check out this question on Stack Overflow: "Python: replace a string by a float in txt file".

The question is confusing, but it appears to be a longish and confused description of simple formatting or template substitution. It's hard to be sure, but it sounds like one of Those Things …

Check this out: "Stupid Template Languages".

Love this:

"The biggest annoyance I have with smart template languages (Mako, Genshi, Jinja2, PHP, Perl, ColdFusion, etc) is that you have the capability to mix core business logic with your end views, hence violating the rules of Model-View-Controller architecture."

Yes, too much power …