Python or Ajax?

[Redefined Horizons]

I've been hearing a ot about AJAX lately. I may have to build a web
application in the near future, and I was curoius:

How does a web application that uses Python compare with one that uses AJAX?

I've done some basic web page design with HTML and CSS, but never any
web applications. I don't want to learn a new language if I can use
Python. Would AJAX offer me any significant advantages?

Thanks,

Scott Huey