Experimental implementation of Ruby's case statement or, rather, Scala's match function.  See docs in pattern.py for details.

examples:

>>> from pattern import switch, Any, Var
>>> switch('B',
...        'A', 1,
...        'B', 2,
...        'C', 3)
2
>>> switch(65,
...        Any(range(91, 100)), 'A',
...        Any(range(81, 90)), 'B',
...        Any(range(61, 80)), 'C',
...        Any(), 'F')
'C'
>>> switch(['+', 10, 20],
...        ['+', Var('a'), Var('b')], lambda a,b: a+b,
...        ['-', Var('a'), Var('b')], lambda a,b: a-b,
...        ['*', Var('a'), Var('b')], lambda a,b: a*b,
...        ['/', Var('a'), Var('b')], lambda a,b: a/b,
...        Var('a'), lambda a: a)
30


Imspired from a Scala pair-programming session with @sandayuu (Tsuyoshi Ushio) at Coderetreat Tokyo 2011.