How to write interactive geometry applets with Python

Question

I am interested in writing interactive applets in Computational Geometry using Python. For starters I would like to code up an applet like this one or this one, in which the user 'mouses in' points and a certain computation is performed.

The reason I ask this is because, I am familiar with Python and being a scripting language I guess it would be easier(and shorter) to write applets in Python rather than Java, a language in which I don't have any experience.

Are there any standard set of libraries to write such applets in Python?