Need information-- Python Architecture

[kkm25]

Hi,
I had a question. I need to give an architecture audit on some opensource.
Me and my teammates have chosen python.

Could someone please tell me, How I should go about the process of deriving 
it's architecture.

1. Should I be looking at the sourcecode??
2. If so what part of the source code should be concntrated upon.
3. How exactly should I go about looking for it's architecture.

Your early response will be very much appreciated.
Thanks,
kusum.