Dash by plotly is also amazing its like shiny but for python! - we were able to whip together an app that would let you drag and drop xyyy data and get a scatter plot instantly - you can try it here (first load takes 1-2s):

https://dash-app-dx9g2r0la6-8000.cloud.kyso.io

It was also really easy to make it, maybe 250 lines of python in total

(guide to making this app is here: https://kyso.io/KyleOS/creating-an-interactive-application-u...)