如何读取嵌套在多个级别中的json

def get_value(json_obj, key):
    if key in json_obj:
        return json_obj[key]
    else:
        for k, v in json_obj.items():
            if isinstance(v, dict):
                result = get_value(v, key)
                if result is not None:
                    return result

{
  "name": "John",
  "age": 30,
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "country": "USA"
  }
}

json_obj = {
  "name": "John",
  "age": 30,
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "country": "USA"
  }
}

street = get_value(json_obj, "street")
print(street)  # 输出：123 Main St

json_obj = {
  "name": "John",
  "age": 30,
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "country": "USA"
  }
}

street = json_obj["address"]["street"]
print(street)  # 输出：123 Main St