On Tue, Dec 08, 2020 at 11:46:59AM -0000, Mathew Elman wrote:
> I would like to propose adding lazy types for casting builtins in a
> lazy fashion. e.g. `lazy_tuple` which creates a reference to the
> source iterable and a morally immutable sequence but only populates
> the tupular container when it or the source is used.
What are your use-cases for this?
Does this include things like `lazy_list`, `lazy_float`, `lazy_bool`,
`lazy_str`, `lazy_bytearray` etc?
> An alternative to adding lazy types / lazy type casting (making it
> possible to implement these oneself) would be to add method call hooks
> to python, since this would allow having a "freeze value" callback
> hooked into the __setitem__ and __getitem__ methods. Hooks may be a
> more useful solution for wider use cases as well.
Nope, sorry, I don't see how that would work. Here I have a list:
L = [50, 40, 30, 20, 10]
Suppose these hooks exist. I want to make a "lazy tuple":
t = lazy_tuple(L)
How do these hooks freeze the list?
What if I have more than one lazy object pointing at the same source?
s = lazy_str(L)
And then follow with a different method call?
L.insert(2, "surprise!")
I just can't see how this will work.
--
Steve
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