如何检查json的嵌套列表中是否存在key？

import json

def check_key_in_nested_list(json_data, key_to_check):
    if isinstance(json_data, dict):
        for key, value in json_data.items():
            if key == key_to_check:
                return True
            if check_key_in_nested_list(value, key_to_check):
                return True
    elif isinstance(json_data, list):
        for item in json_data:
            if check_key_in_nested_list(item, key_to_check):
                return True
    return False

# 示例JSON数据
json_str = '''
{
    "name": "John",
    "age": 30,
    "cars": [
        {"model": "BMW 230", "mpg": 27.5},
        {"model": "Ford Edge", "mpg": 24.1}
    ],
    "houses": [
        {"city": "New York", "zipcode": "10001"},
        {"city": "Los Angeles", "zipcode": "90001"}
    ]
}
'''

# 将JSON字符串转换为Python对象
json_data = json.loads(json_str)

# 检查是否存在key "zipcode"
key_to_check = "zipcode"
result = check_key_in_nested_list(json_data, key_to_check)
print(f"Key '{key_to_check}' exists: {result}")