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# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.
from __future__ import annotations
from typing import Any, Dict
def nested_update(this: Dict[Any, Any], that: Dict[Any, Any]) -> Dict[Any, Any]:
"""Merge two nested dictionaries.
Effectively a recursive ``dict.update``.
Examples
--------
Merge two flat dictionaries:
>>> nested_update(
... {'a': 1, 'b': 2},
... {'b': 3, 'c': 4}
... )
{'a': 1, '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},
... )
{'x': {'a': 1, 'b': 3, 'c': 4}, 'y': 5, 'z': 7, '0': 8}
"""
for key, value in this.items():
if isinstance(value, dict):
if key in that and isinstance(that[key], dict):
nested_update(this[key], that[key])
elif key in that:
this[key] = that[key]
for key, value in that.items():
if key not in this:
this[key] = value
return this
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