[Python-ideas] Vectorization [was Re: Add list.join() please]

[David Mertz]

Slightly more on my initial behavior:

>>> Vector({1:2,3:4})
TypeError: Ambiguity vectorizing a map, perhaps try it.keys(), it.values(),
or it.items()

>>> Vector(37)
TypeError: Vector can only be initialized with an iterable

>>> Vector("hello")
<Vector of 'hello'>


I'm wondering if maybe making a vector out of a scalar should simply be a
length-one vector. What do you think?

Also, should a single string be treated like a vector of characters or like
a scalar? It feels kinda pointless to make a vector of characters since I
cannot think of anything it would do better than a plain string already
does (largely just the same thing slower).

On Sat, Feb 2, 2019 at 8:54 PM David Mertz <mertz at gnosis.cx> wrote:

> Here is a very toy proof-of-concept:
>
> >>> from vector import Vector
> >>> l = "Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec".split()
> >>> v = Vector(l)
> >>> v
> <Vector of ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
> 'Oct', 'Nov', 'Dec']>
> >>> v.strip().lower().replace('a','X')
> <Vector of ['jXn', 'feb', 'mXr', 'Xpr', 'mXy', 'jun', 'jul', 'Xug', 'sep',
> 'oct', 'nov', 'dec']>
> >>> vt = Vector(tuple(l))
> >>> vt
> <Vector of ('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
> 'Oct', 'Nov', 'Dec')>
> >>> vt.lower().replace('o','X')
> <Vector of ('jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep',
> 'Xct', 'nXv', 'dec')>
>
>
> My few lines are at https://github.com/DavidMertz/stringpy
>
> One thing I think I'd like to be different is to have some way of
> accessing EITHER the collection being held OR each element.  So now I just
> get:
>
> >>> v.__len__()
> <Vector of [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3]>
>
>
> Yes, that's an ugly spelling of `len(v)`, but let's bracket that for the
> moment.  It would be nice also to be able to ask "what's the length of the
> vector, in a non-vectorized way" (i.e. 12 in this case).  Maybe some naming
> convention like:
>
> >>> v.collection__len__()
> 12
>
>
> This last is just a possible behavior, not in the code I just uploaded.
>
>
> On Sat, Feb 2, 2019 at 6:47 PM Chris Angelico <rosuav at gmail.com> wrote:
>
>> On Sun, Feb 3, 2019 at 10:36 AM Ben Rudiak-Gould <benrudiak at gmail.com>
>> wrote:
>> >
>> > On Sat, Feb 2, 2019 at 3:23 PM Christopher Barker <pythonchb at gmail.com>
>> wrote:
>> >>
>> >> a_list_of_strings.strip().lower().title()
>> >>
>> >> is a lot nicer than:
>> >>
>> >> [s.title() for s in (s.lower() for s in [s.strip(s) for s in
>> a_list_of_strings])]
>> >>
>> >> or
>> >>
>> >> list(map(str.title, (map(str.lower, (map(str.strip,
>> a_list_of_strings)))) # untested
>> >
>> > In this case you can write
>> >
>> >     [s.strip().lower().title() for s in a_list_of_strings]
>>
>> What if it's a more complicated example?
>>
>> len(sorted(a_list_of_strings.casefold())[:100])
>>
>> where the len() is supposed to give back a list of the lengths of the
>> first hundred strings, sorted case insensitively? (Okay so it's a
>> horrible contrived example. Bear with me.)
>>
>> With current syntax, this would need multiple map calls or comprehensions:
>>
>> [len(s) for s in sorted(s.casefold() for s in a_list_of_strings)[:100]]
>>
>> (Better examples welcomed.)
>>
>> ChrisA
>> _______________________________________________
>> Python-ideas mailing list
>> Python-ideas at python.org
>> https://mail.python.org/mailman/listinfo/python-ideas
>> Code of Conduct: http://python.org/psf/codeofconduct/
>>
>
>
> --
> Keeping medicines from the bloodstreams of the sick; food
> from the bellies of the hungry; books from the hands of the
> uneducated; technology from the underdeveloped; and putting
> advocates of freedom in prisons.  Intellectual property is
> to the 21st century what the slave trade was to the 16th.
>


-- 
Keeping medicines from the bloodstreams of the sick; food
from the bellies of the hungry; books from the hands of the
uneducated; technology from the underdeveloped; and putting
advocates of freedom in prisons.  Intellectual property is
to the 21st century what the slave trade was to the 16th.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-ideas/attachments/20190202/13f3a475/attachment.html>