John Machin wrote:
On Apr 16, 10:13 am, Dave Angel <da...@ieee.org> wrote:
For the Color example, how's this for a starting place:
class Color(object):
def __init__(self, name, enum):
self.enum =num
self.name =ame
setattr(Color, name, self)
@staticmethod
def seal():
del Color.__init__
del Color.seal
def __str__(self):
return self.name
Color("RED", 4)
Color("GREEN", 11)
Color.seal() #prevent any new instances from being created
b =olor.RED
print type(b)
print str(b)
a =olor.GREEN
print a
So when you use Color.GREEN in an expression or pass it as a function/
method argument, it produces "GREEN" ... doesn't emulation of a C-
style enum require it to produce 11?
print a.enum
C-style enums have their limitations. In any case, the OP had specific
requirements, and I came close to meeting them. I figured the purpose
was to accomplish the same goal (or better) as enums do in C. So the
object should be able to be passed around without regard to its
"value." And it's printable value is "GREEN". But if it's used as a
lookup in a dictionary, it just works right, without getting confused
with an integer that might also be in the dictionary.
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