Jim Jewett wrote:
> On 4/28/06, Greg Wilson <[EMAIL PROTECTED]> wrote:
>> - introduce '@' as a prefix operator meaning 'freeze'.
>
> I mostly like the concept, but not the operator. Using @ limits it to
> syntax-created literals (because of ambiguity with decorators). Since
> numbers are already immutable, that basically means lists, dicts, and
> maybe sets, but not even user-defined subclasses. (And you don't have
> to do it with tuples, because ... uh ...) I'm not sure what to use
> instead, except maybe for the backwards quote, which means I have to
> duck now too. ("frozen" or "snapshot" might be too long to be
> useful.)
How about the '!' which is currently used indicate a python long and an
integer. Here it would indicate the difference between a frozen
container and a mutable container.
frozen_set = {1, 2, 3}!
frozen_dict = {1:'a', 2:'b', 3:'c'}!
> I am slightly concerned that it *might* be a bad idea to encourage
> immutable containers, in the same way that it can be a bad idea to
> prevent subclassing or even to use a __slots__ field.
We can always discourage something in the docs by giving reasons not to
use that which isn't a good idea in the context for which it isn't a
good idea.
Cheers,
Ron
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