Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/traitlets/utils/nested_update.py: 23%

1# Copyright (c) IPython Development Team. 

2# Distributed under the terms of the Modified BSD License. 

3from __future__ import annotations 

4 

5from typing import Any, Dict 

6 

7 

8def nested_update(this: Dict[Any, Any], that: Dict[Any, Any]) -> Dict[Any, Any]: 

9 """Merge two nested dictionaries. 

10 

11 Effectively a recursive ``dict.update``. 

12 

13 Examples 

14 -------- 

15 Merge two flat dictionaries: 

16 >>> nested_update( 

17 ... {'a': 1, 'b': 2}, 

18 ... {'b': 3, 'c': 4} 

19 ... ) 

20 {'a': 1, 'b': 3, 'c': 4} 

21 

22 Merge two nested dictionaries: 

23 >>> nested_update( 

24 ... {'x': {'a': 1, 'b': 2}, 'y': 5, 'z': 6}, 

25 ... {'x': {'b': 3, 'c': 4}, 'z': 7, '0': 8}, 

26 ... ) 

27 {'x': {'a': 1, 'b': 3, 'c': 4}, 'y': 5, 'z': 7, '0': 8} 

28 

29 """ 

30 for key, value in this.items(): 

31 if isinstance(value, dict): 

32 if key in that and isinstance(that[key], dict): 

33 nested_update(this[key], that[key]) 

34 elif key in that: 

35 this[key] = that[key] 

36 

37 for key, value in that.items(): 

38 if key not in this: 

39 this[key] = value 

40 

41 return this