如何从输入生成嵌套的Json对象？

import json

# 输入数据示例
input_data = {
    "name": "John",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "New York"
    },
    "hobbies": ["reading", "traveling"]
}

# 创建空的Json对象
json_obj = {}

# 解析输入数据
name = input_data["name"]
age = input_data["age"]
address = input_data["address"]
street = address["street"]
city = address["city"]
hobbies = input_data["hobbies"]

# 构建Json对象
json_obj["name"] = name
json_obj["age"] = age
json_obj["address"] = {
    "street": street,
    "city": city
}
json_obj["hobbies"] = hobbies

# 将Json对象转换为字符串
json_str = json.dumps(json_obj)

print(json_str)

{
    "name": "John",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "New York"
    },
    "hobbies": ["reading", "traveling"]
}