[Python-ideas] strings as iterables - from str.startswith taking any iterator instead of just tuple

[Amber Yust]

__fromiter__, anyone?

On Sat Jan 04 2014 at 3:31:59 PM, Masklinn <masklinn at masklinn.net> wrote:

> On 2014-01-04, at 23:59 , Steven D'Aprano <steve at pearwood.info> wrote:
> > On Sat, Jan 04, 2014 at 11:22:16AM +0100, spir wrote:
> >> On 01/03/2014 07:11 PM, Bruce Leban wrote:
> >>> As to the idea of making strings not iterable, that would break my
> code. I
> >>> write a lot of code to manipulate words (to create puzzles) and
> iterating
> >>> over strings is fundamental. In fact, I'd like to have strings as
> results
> >>> of iteration operations on strings:
> >>>
> >>>>>>>>> sorted('string')
> >>> 'ginrst'
> >>>>>>>>> list(itertools.permutations('bar'))
> >>> ['bar', 'bra', 'abr', 'arb', 'rba', 'rab']
> >
> > That would be nice to have.
>
> More generally, it would be nice if a sequence type could specify how to
> derive a new instance of itself (from an iterable for instance).
> Constructors don't necessarily work (e.g. str's constructor). Clojure
> has such a concept through the IPersistentCollection protocol:
> empty(coll) creates a new (empty) instance of coll (clojure's
> collections being immutable, it makes sense to create an empty
> collection then add stuff into it via into() or conj())
>
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