我如何修复这个函数来递归地搜索一个对象，以获得一个键的所有实例？

def search_key(obj, key):
    results = []

    if isinstance(obj, dict):
        for k, v in obj.items():
            if k == key:
                results.append(v)
            elif isinstance(v, (dict, list)):
                results.extend(search_key(v, key))

    elif isinstance(obj, list):
        for item in obj:
            results.extend(search_key(item, key))

    return results

data = {
    "name": "John",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "New York"
    },
    "friends": [
        {
            "name": "Alice",
            "age": 25
        },
        {
            "name": "Bob",
            "age": 35
        }
    ]
}

results = search_key(data, "name")
print(results)

['John', 'Alice', 'Bob']