使用r替换json文件中的空方括号

import json

# 读取json文件
with open('file.json', 'r') as f:
    data = json.load(f)

def replace_empty_brackets(obj):
    if isinstance(obj, list):
        for i in range(len(obj)):
            if obj[i] == []:
                obj[i] = 'r'
            else:
                replace_empty_brackets(obj[i])
    elif isinstance(obj, dict):
        for key in obj:
            if obj[key] == []:
                obj[key] = 'r'
            else:
                replace_empty_brackets(obj[key])

# 替换空方括号
replace_empty_brackets(data)

# 将修改后的Python对象转换为json格式
json_data = json.dumps(data, indent=4)

# 将json数据写入文件
with open('file.json', 'w') as f:
    f.write(json_data)