Are people really running jupyter notebooks in some sort of production system? I was always under the impression that the idea was to do some exploratory work i

Are people really running jupyter notebooks in some sort of production system? I was always under the impression that the idea was to do some exploratory work in the notebook and test out some basic functionality. After this it should just be a matter of copying the code to an actual module, and add tests as desired (though I don't necessarily subscribe to TDD per se).