What are your plans for a data table UI?
Shameless plug: I created the open source Buckaroo table for jupyter (embeddable in other contexts) with histograms, summary stats, search... I love talking tables if you want to get in touch.
Coincidentally, one of the first components I wrote for Scripton was a virtualized table for handling million+ row dataframes with Tufte-esque inline visualizations (in a much evolved form, it currently backs the REPL).
The data table got deferred to focus on the visualization bits for the initial release, but it's definitely planned!
Did you write your own table?
Million+ row handling is nice. Once I figured out window based display of tables, documentation and a bunch of other pieces of architecture became simpler. Previously I sent the whole dataset or a sample of it.
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Is Scripton user extendable? Do you expect ipywidgets/anywidgets based projects to plug in?
Yup, it was written from scratch. Yeah, having a flexible virtualized table certainly makes it easier to build more complex things on top (a lesson I initially learned from NSTableView/UITableView).
Currently, it's not user extendable. While it does support some IPython features (eg: Python classes that implement IPython's rich outputs also work in Scripton), ipywidgets are currently not supported.