On Mon, Jul 13, 2020, 3:04 PM Christopher Barker <pythonchb@gmail.com> wrote:
Is there ANY chance of setting the default reply-to to the list? I know everyone else thinks that's a bid idea, but I doubt this was actually intended just for me.

If it was, I apologize for bringing it back on the list.

On Sun, Jul 12, 2020 at 10:12 PM Inada Naoki <songofacandy@gmail.com> wrote:
On Mon, Jul 13, 2020 at 1:51 PM Christopher Barker <pythonchb@gmail.com> wrote:
As I and Eric already said several times, we can do it in C already --


itertools.islice is implemented in C too. No need to call next() from
Python stack.

Ahh -- thanks! I had no idea islice() was in C -- yes, then, there probably is little to gain from a C implementation.

I'd still be interested in the performance comparison, but not enough to try to write a direct-access-to-the-internals-of-dict C version myself :-)

I still like the idea of indexing the order-preserving dict, but we do seem to not have any compelling use cases.

Some ideas for optimizing lookup of ordered indexed structures:

https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html :

> loc, .iloc, and also [] indexing can accept a callable as indexer. See more at Selection By Callable.

Pandas > Enhancing performance > Numba > Vectorize

https://scikit-learn.org/stable/modules/generated/sklearn.feature_extraction.DictVectorizer.html )



> Methods like pyarrow.Table.from_pandas() have a preserve_index option which defines how to preserve (store) or not to preserve (to not store) the data in the index member of the corresponding pandas object. This data is tracked using schema-level metadata in the internal arrow::Schema object.

... Type signatures are particularly helpful for indexes.

Particularly if someone does get a reservoir sampling implementation in the stdlib. (see another thread for that)


Christopher Barker, PhD

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