[Python-ideas] Sequence views

David Mertz mertz at gnosis.cx
Sun Jul 17 17:56:29 EDT 2016

I don't want to speak for Serhiy, but it seems like he wants NumPy-like
behaviors over generic sequences. I think this idea is appealing.

For example, Python list has O(1) append, while the equivalent for
np.ndarray would be an O(n) copy to a larger array.

Expressing those NumPy affordances genetically feels like a good thing.
However, maybe this is something that could live in PyPI first top
stabilize APIs.

On Jul 17, 2016 1:08 PM, "Michael Selik" <michael.selik at gmail.com> wrote:

> On Sun, Jul 17, 2016, 3:22 PM Serhiy Storchaka <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 [1].
>> 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 [2].
> NumPy slicing and reshaping sounds like it satisfies these requirements.
> Does it not?
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