The case is more like when you want to assert against some of the contents of a dictionary but not all (say 60% of a 30 key dict), and not all those assertions

The case is more like when you want to assert against some of the contents of a dictionary but not all (say 60% of a 30 key dict), and not all those assertions are based on == (and it's a multilevel nested dict). There's no particurly terse why to write an example I'm afraid.