[lochieferrier]

You can already do this exact thing with a Python library on the user machine, see here for install instructions: https://gpkit.readthedocs.io/en/latest/installation.html

The intent here is to make it easy for people to get started and quickly write models, without needing to go through installing a set of packages.

[amelius]

There are also services that let you run arbitrary Python code in the browser, e.g. [1].

[1] https://trinket.io/

[lochieferrier]

For sure, but they have a limited range of packages installed, and can be tricky to tune towards a specific need.