Phillip Eby gives a long list of ways that Python is not Java. Talking about some Python code written by Java developers:
the sad thing is that these poor folks worked much, much harder than they needed to, in order to produce much more code than they needed to write, that then performs much more slowly than the equivalent idiomatic Python would.
He then describes in detail ways that Java idioms aren't right for Python. One he mentioned I wasn't familiar with: the property built-in function, new in Python 2.2.