`traitlets.utils.nested_update:nested_update`

Signature

def nested_update ( this : dict[Any, Any] , that : dict[Any, Any] ) → dict[Any, Any]

Merge two nested dictionaries.

Effectively a recursive dict.update.

Merge two flat dictionaries:

nested_update(
    {'a': 1, 'b': 2},
    {'b': 3, 'c': 4}
)

Merge two nested dictionaries:

nested_update(
    {'x': {'a': 1, 'b': 2}, 'y': 5, 'z': 6},
    {'x': {'b': 3, 'c': 4}, 'z': 7, '0': 8},
)