[Python] Databricks - How to restrict the values permitted in a job or task parameter?

I have a notebook with a parameter set within it via a widget, like this:

dbutils.widgets.dropdown("My widget", "A", ["A", "B", "C"])

my_variable = dbutils.widgets.get("My widget")


As you can see, the only options available to pick are 'A', 'B', and 'C'. I want to run this notebook through a job, so I can log runs. I want to set the value of my_variable through a job or task parameter in the job.

I know how to create a job or task parameter, and that the value this is set to can be picked up by widgets.get. However, I don't know how I can restrict the values that can be entered to 'A', 'B', and 'C'; there doesn't seem to be an option to do this in the Databricks job UI.

Does anyone know how to do this please?

Continue reading...