David A. Wheeler wrote:
> Egil Möller:
>> It would also be interresting to implement the Pythonic list features,
>> e.g. slices and slice assignment. Extra points for implementing both a
>> destructive and a non-destructive version. E.g.
>
> That was the idea of "bracketaccess", but that means that someone
> has to figure out those semantics.
>
> let
> group
> a b[1:5]
> c d[0:3,x,5:7,9:]
>
> Hmm, that doesn't look very Lispish - that has lots of
> unnecessary punctuation to bite you later when you start manipulating lists.
Wouldn't that depend on what the reader spit out? What if
b[1:5]
becomes
(bracketaccess b (slice 1 5))
and
d[0:3,x,5:7,9:]
becomes
(bracketaccess d '((slice 0 3) x (slice 5 7) (slice 9)))
? In Python, what gets passed to getitem/setitem is any object,
including integers and slices (strings for namespace dicts, etc.), or a
tuple of the same. Heck, you could stipulate that a list is always
passed, even if it's singular, and obtain a nice analogy between list
construction using [] and indexing using [].
Neil
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