convert a json file to a python dictionnary of array

[Reims]

what have you tried? Note that so called json that you have is not valid one. it looks like already converted to JSON object in python

thanks Buran,
i find out this solution

from collections import defaultdict

data = [{'_id': '1', 'date': '2019-09-07', 'name': 'abi', 'value': 0, 'unit': '°C'},
{'_id': '2', 'date': '2019-09-08', 'name': 'allo', 'value': 3, 'unit': '°F'},
{'_id': '3', 'date': '2019-09-09', 'name': 'ali', 'value': 0, 'unit': '°C'}]

result = defaultdict(list)
for i in data:
    for k, v in i.items():
        result[k].append(v)
print(result)