[Python-ideas] Sequence views
storchaka at gmail.com
Tue Jul 19 10:48:16 EDT 2016
On 18.07.16 01:21, Wes Turner wrote:
> There are a number of generic implementations of these sequence algorithms:
> * http://toolz.readthedocs.io/en/latest/api.html#itertoolz
> * https://github.com/kachayev/fn.py#itertools-recipes
> * http://funcy.readthedocs.io/en/stable/seqs.html
> * http://docs.python.org/2/reference/expressions.html#slicings
> * https://docs.python.org/2/library/itertools.html#itertools.islice
> * https://docs.python.org/3/library/itertools.html#itertools.islice
Aren't all these implementations works with iterables and iterators?
> On Jul 17, 2016 3:23 PM, "Serhiy Storchaka"
> <storchaka at gmail.com
> <mailto:storchaka at gmail.com>> wrote:
> > Maybe it's time to add a new module for sequence-specific functions
> (seqtools?). It should contain at least two classes or fabric functions:
> > 1. A view that represents a sliced subsequence. Lazy equivalent of
> seq[start:end:step]. This feature is implemented in third-party module
> dataview .
The result of itertools.islice() is not a sequence.
> > 2. A view that represents a linear sequence as 2D array. Iterating
> this view emits non-intersecting chunks of the sequence. For example it
> can be used for representing the bytes object as a sequence of 1-byte
> bytes objects (as in 2.x), a generalized alternative to iterbytes() from
> PEP 467 .
toolz.itertoolz.partition() is just a generator.
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