Back in 2001 I started writing an Apple ][ emulator in Python. In 2006 I started a rewrite but today I went back to my original 2001 version, updated it a little and put it up on GitHub.
There are still issues to sort out but you can get the code at: http://jtauber.com/applepy/
The original post was in the categories: python announcements open_source apple_ii applepy but I'm still in the process of migrating categories over.