On Tue, 23 Sep 2008 15:23:35 +1000, Tom Harris wrote:
> Greetings,
>
> I want to have a class as a container for a bunch of symbolic names for
> integers, eg:
>
> class Constants:
> FOO = 1
> BAR = 2
>
> Except that I would like to attach a docstring text to the constants, so
> that help(Constants.FOO) will print some arbitrary string. Sort of a
> very limited implementation of PEP 224. The only solution that I can see
> is to subclass int.__new__(), since once I have an int all it's
> attributes are immutable.
Others have suggested solutions, which may be better, but for
completeness consider using properties:
def make_const(value, doc=''):
def getter(self):
return value
return property(getter, None, None, doc)
class Foo(object):
x = make_const(1.234, 'a special number')
The only gotcha is that while help(Foo.x) works, help(Foo().x) does not.
--
Steven
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