[Python-Dev] PEP 3103: A Switch/Case Statement
kd5bjo at gmail.com
Wed Jun 28 20:25:47 CEST 2006
> > Forget subroutines for a moment - the main point of the thread was the
> > idea that the dispatch table was built explicitly rather than
> > automatically - that instead of arguing over first-use vs.
> > function-definition, we let the user decide. I'm sure that my specific
> > proposal isn't the only way that this could be done.
> But anything that makes the build explicit is going to be so much more
> ugly. And I still think you're trying to solve the wrong problem.
Only if the programmer has to see it. The dispatch table need not
include the behaviors of each of the cases; it only needs to define
what the cases are. In most of the use cases I've seen, switch is
used to define behavior for different values of an enumeration. The
dispatch table for an enumeration can be built wherever the values for
the enumeration are defined (such as in a module). Programmers don't
need to bother with making a dispatch table unless they are defining
enumeration values themselves.
-- Eric Sumner
Note: I sent an email yesterday with a proposal to this effect, but it
seems to have been lost. If anybody wants, I can resend it.
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