Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/traitlets/utils/nested_update.py: 9%

1# Copyright (c) IPython Development Team. 

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

3 

4 

5def nested_update(this, that): 

6 """Merge two nested dictionaries. 

7 

8 Effectively a recursive ``dict.update``. 

9 

10 Examples 

11 -------- 

12 Merge two flat dictionaries: 

13 >>> nested_update( 

14 ... {'a': 1, 'b': 2}, 

15 ... {'b': 3, 'c': 4} 

16 ... ) 

17 {'a': 1, 'b': 3, 'c': 4} 

18 

19 Merge two nested dictionaries: 

20 >>> nested_update( 

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

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

23 ... ) 

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

25 

26 """ 

27 for key, value in this.items(): 

28 if isinstance(value, dict): 

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

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

31 elif key in that: 

32 this[key] = that[key] 

33 

34 for key, value in that.items(): 

35 if key not in this: 

36 this[key] = value 

37 

38 return this