[Python-Dev] Switch statement
rogermiller at alum.mit.edu
Thu Jun 22 10:06:45 CEST 2006
Ka-Ping Yee wrote:
> Hmm, this is rather nice. I can imagine possible use cases for
> switch x:
> case > 3: foo(x)
> case is y: spam(x)
> case == z: eggs(x)
Part of the readability advantage of a switch over an if/elif chain is
the semantic parallelism, which would make me question mixing different
tests in the same switch. What if the operator moved into the switch
switch x ==:
case 1: foo(x)
case 2, 3: bar(x)
switch x in:
case (1, 3, 5): do_odd(x)
case (2, 4, 6): do_even(x)
"switch x:" could be equivalent to "switch x ==:", for the common case.
I've also been wondering whether the 'case' keyword is really necessary?
Would any ambiguities or other parsing problems arise if you wrote:
It is debatable whether this is more or less readable, but it seemed
like an interesting question for the language lawyers.
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