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More efficient/elegant branching

Musbur wrote:
> Hello,
> I have a function with a long if/elif chain that sets a couple of 
> variables according to a bunch of test expressions, similar to function 
> branch1() below. I never liked that approach much because it is clumsy 
> and repetetive, and pylint thinks so as well. I've come up with two 
> alternatives which I believe are less efficient due to the reasons given 
> in the respective docstrings. Does anybody have a better idea?

I tried a lot of times to write down a useful Switch module
without convincing myself. Recently here is what I ended up
with, what do you think ?