Answers for "merge two dictionaries python 2.7"

merge multile dict

dict1 = {"a":1, "b":2}
dict2 = {"x":3, "y":4}
merged = {**dict1, **dict2}
print(merged) # {'a': 1, 'b': 2, 'x': 3, 'y': 4}

how to merge a list of dictionaries in python

from collections import defaultdict
dict_list = {
	1: [{
			"x": "test_1",
			"y": 1
		},
		{
			"x": "test_2",
			"y": 1
		}, {
			"x": "test_1",
			"y": 2
		}
	],
}
print(dict_list) # {1: [{'x': 'test_1', 'y': 1}, {'x': 'test_2', 'y': 1}, {'x': 'test_1', 'y': 2}]}

data = dict()
for key, value in dict_list.items():
    tmp = defaultdict(int)
    for index, item in enumerate(value):
        tmp[item.get("x") ] += item.get("y")

    for tmp_key, tmp_value in tmp.items():
        data.setdefault(key, []).append(
            {
                "x": tmp_key,
                "y": tmp_value
            }
        )
print(data) # {1: [{'x': 'test_1', 'y': 3}, {'x': 'test_2', 'y': 1}]}

# test 1 values is added together