[Phillip Eby]
> I would like to be able to use switches on types, enumerations, and the like.
Be careful about wanting everything and getting nothing.
My proposal is the simplest thing that gets the job done for key use cases
found
in real code.
Also, it is defined tightly enough to allow room for growth and elaboration
over
time.
Good luck proposing some alternative that is explainable, has no hidden
surprises,
has an easy implementation, and allows fast hash-table style dispatch.
Besides, if you want to switch on other types, it is trivial to include a
reverse mapping
(like that in the opcode.py example). Reverse mappings are to build and easy
to
read:
# enumeration example
colormap = {}
for code, name in enumerate('RED ORANGE YELLOW GREEN BLUE INDIGO
MAGENTA'.split()):
globals()[name] = code
colormap[code] = name
def colormixer(color):
switch colorname[color]:
case 'RED', 'YELLOW', 'BLUE':
handle_primary()
case 'MAGENTA':
get_another_color()
default:
handle_rest()
colormixer(RED)
colormixer(ORANGE)
Raymond
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