Ok. Thanks.
Until I get to that, is there an example somewhere regarding using the "all" option?
My (temporary) work-around is using multiple filter queries, but I don't think I'm getting the filters to work as "and" instead of "or"...
So something like this -
tag_filtered_training_tasks = Task.get_tasks(task_filter={'tags': [tag1, tag2, tag3], 'type': ['training']})
should result in very very few tasks, but that's not what seems to be happening.
(I've tried different guesses regarding the usage of "all", but only managed to run into a variety of errors...)