Favorite non-python language trick?

[D H]

Joseph Garvin wrote:
> I'm curious -- what is everyone's favorite trick from a non-python 
> language? And -- why isn't it in Python?

You can try out new features yourself now using various python 
extensions or descendants:
http://livelogix.net/logix/
    - macros, no statement/expression distinction
http://students.ceid.upatras.gr/~sxanth/pyc/
    - assignments are expressions, you can try other features never added
    python like a ternary operator (x ? true action:false action)
http://boo.codehaus.org/
    assignments are expressions, macros, static typing, no more "self"
    required, ...