[Python-ideas] Sequence views
storchaka at gmail.com
Tue Jul 19 10:43:49 EDT 2016
On 17.07.16 23:08, Michael Selik wrote:
> On Sun, Jul 17, 2016, 3:22 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 .
> 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 .
> NumPy slicing and reshaping sounds like it satisfies these requirements.
> Does it not?
NumPy have similar features, but they work with packed arrays of
specific numeric types, not with general sequences (such as list or
str). And NumPy is a large library, providing a number of features not
needed for most Python users.
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