Python:根据Json数据中的键对每个国家/地区的值进行求和

import json

def sum_values_by_key(json_data, key):
    sum_dict = {}
    for item in json_data:
        country = item[key]
        value = item['value']
        if country in sum_dict:
            sum_dict[country] += value
        else:
            sum_dict[country] = value
    return sum_dict

# 示例Json数据
json_data = [
    {"country": "China", "value": 10},
    {"country": "China", "value": 20},
    {"country": "USA", "value": 15},
    {"country": "USA", "value": 25},
    {"country": "Japan", "value": 5}
]

# 根据键'country'对值进行求和
result = sum_values_by_key(json_data, 'country')
print(result)

{'China': 30, 'USA': 40, 'Japan': 5}