One thing you might be used to in Java that you won't find in Python is strict privacy. This is not so much something to look out for as it is something not to look for (I am embarrassed by how long I searched for a Python equivalent to 'private' when I started out!). Instead, Python has much more transparency and easier introspection than Java. This falls under what is sometimes described as the "we're all consenting adults here" philosophy. There are a few conventions and language mechanisms to help prevent accidental use of "unpublic" methods and so forth, but the whole mindset of information hiding is virtually absent in Python.
