pip install ops-reactive-interface==1.0.1

Helper for interface APIs written for the charm operator framework, which can register them with charms.reactive to function similarly to Endpoints.

Source
Among fairly niche packages on PyPI.
Over 432 downloads in the last 90 days.

Version usage of ops-reactive-interface

Proportion of downloaded versions in the last 3 months (only versions over 1%).

1.0.1

76.16%

1.0.0

23.84%