将多个JSON文件转换为CSV文件，每个文件在一列中

import json
import csv
import os

def json_to_csv(json_files, output_csv):
    with open(output_csv, 'w', newline='', encoding='utf-8') as csvfile:
        fieldnames = set()
        writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
        
        for json_file in json_files:
            with open(json_file, 'r', encoding='utf-8') as f:
                data = json.load(f)
                if not fieldnames:
                    fieldnames.update(data[0].keys())
                    writer.writeheader()
                for item in data:
                    writer.writerow(item)

# 示例用法
json_files = ['file1.json', 'file2.json', 'file3.json']
output_csv = 'output.csv'
json_to_csv(json_files, output_csv)