Are you suggesting that dict views would become subscriptable?
In [3]: %doctest_mode
Exception reporting mode: Plain
Doctest mode is: ON
>>> x = dict(a=2, b=3, c=4)
>>> x.items()[3]
Traceback (most recent call last):
File "<ipython-input-5-519a9a9c5ae6>", line 1, in <module>
x.items()[3]
TypeError: 'dict_items' object is not subscriptable
On Thu, Jul 30, 2020, 12:05 PM Christopher Barker <python...@gmail.com>
wrote:
> On Wed, Jul 29, 2020 at 7:23 AM Wes Turner <wes.tur...@gmail.com> wrote:
>
>> .iloc[] is the Pandas function for accessing by integer-location:
>>
>> https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.iloc.html
>>
>
> I'm not sure I quite get the analogy here, but ...
>
> >>> odict.iloc[3]
>>
>>
>> Would this be the only way to access only item 4 from an odict of length
>> greater than 4 with slice notation for dict views generated from selection
>> by integer-location?
>>
>
> are suggesting that we add another attribute to dicts to provide "index"
> access? I'm not sure the advantage of that, as we already have the dict
> views, so I guess it's nice not to have the type the parentheses:
>
> odict.items()[3] IS a bit klunkier than odict.iloc[3]
>
> (Side note: why ARE the views provided by methods, rather than properties?
> But I digress ...)
>
>
>> >>> odict[3:4]
>>
>
> that would be possible.
>
> What does this do? Confusing to a beginner:
>>
>> >>> odict[3,]
>>
>
> no more confusing than it is for Sequences, is it?
>
> In [4]: l[3,]
>
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call last)
> <ipython-input-4-ca8ec5ca5475> in <module>
> ----> 1 l[3,]
>
> TypeError: list indices must be integers or slices, not tuple
>
> But yes, if we allowed dicts to be indexable with slices, they still
> couldn't be indexed by single indexes (unless that value happened to be a
> key) so there would be no way to get a single item by index, as a length-1
> slice would presumably return a dict with one item.
>
> So yeah, if indexing, slicing were to happen, it would have to be in the
> views.
>
> But this does bring up that there are a lot of places where slice notation
> could be used outside of [] -- and that would be handy for use cases like
> pandas, even if not for dicts.
>
> -CHB
>
> --
> Christopher Barker, PhD
>
> Python Language Consulting
> - Teaching
> - Scientific Software Development
> - Desktop GUI and Web Development
> - wxPython, numpy, scipy, Cython
>
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