在Python中使用主键合并JSON文件

import json
from collections import defaultdict

def merge_json_files(files):
    merged_data = defaultdict(list)

    for file in files:
        with open(file, 'r') as f:
            data = json.load(f)
            for item in data:
                key = item['key']  # 假设JSON文件中的主键为'key'
                merged_data[key].append(item)

    merged_list = []
    for key, values in merged_data.items():
        merged_list.append({key: values})

    return merged_list

files = ['file1.json', 'file2.json', 'file3.json']
merged_json = merge_json_files(files)