merge dicts python

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Samuel
01 Nov 2020
1dict.update([other])
2
source
Paolo
08 Jul 2018
1dict1 = {'color': 'blue', 'shape': 'square'}
2dict2 = {'color': 'red', 'edges': 4}
3
4dict1.update(dict2) #if a key exists in both, it takes the value of the second dict
5# dict1 = {'color': 'red', 'shape': 'square', 'edges': 4}
6# dict2 is left unchanged
source
Jonah
06 Jan 2017
1z = x | y          # NOTE: 3.9+ ONLY
2z = {**x, **y}		# NOTE: 3.5+ ONLY
source
Arda
17 Jun 2018
1def merge_dicts(dict1, dict2):
2        """Here's an example of a for-loop being used abusively."""
3        return {**dict2, **{k: (v if not (k in dict2) else (v + dict2.get(k)) if isinstance(v, list) else merge_dicts(v, dict2.get(k))) if isinstance(v, dict) else v for k, v in dict1.items()}}
Caitlyn
11 Jan 2020
1from collections import defaultdict
2dict_list = {
3	1: [{
4			"x": "test_1",
5			"y": 1
6		},
7		{
8			"x": "test_2",
9			"y": 1
10		}, {
11			"x": "test_1",
12			"y": 2
13		}
14	],
15}
16print(dict_list) # {1: [{'x': 'test_1', 'y': 1}, {'x': 'test_2', 'y': 1}, {'x': 'test_1', 'y': 2}]}
17
18data = dict()
19for key, value in dict_list.items():
20    tmp = defaultdict(int)
21    for index, item in enumerate(value):
22        tmp[item.get("x") ] += item.get("y")
23
24    for tmp_key, tmp_value in tmp.items():
25        data.setdefault(key, []).append(
26            {
27                "x": tmp_key,
28                "y": tmp_value
29            }
30        )
31print(data) # {1: [{'x': 'test_1', 'y': 3}, {'x': 'test_2', 'y': 1}]}
32
33# test 1 values is added together
Guillaume
24 Jul 2017
1>>> from collections import ChainMap
2>>> a = [{'a':1},{'b':2},{'c':1},{'d':2}]
3>>> dict(ChainMap(*a))
4{'b': 2, 'c': 1, 'a': 1, 'd': 2}
5
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