由于不需要的键，无法循环访问JSON对象

import json

json_str = '''
{
  "name": "John",
  "age": 30,
  "address": {
    "street": "123 Street",
    "city": "New York",
    "country": "USA"
  }
}
'''

# 将 JSON 字符串解析为对象
data = json.loads(json_str)

# 遍历 JSON 对象的键值对
for key, value in data.items():
    # 判断是否需要访问该键
    if key == "address":
        continue  # 跳过不需要的键
    
    # 对于需要访问的键，根据值的类型进行相应操作
    if isinstance(value, str):
        print(key, ":", value)
    elif isinstance(value, int):
        print(key, ":", value)
    elif isinstance(value, dict):
        for sub_key, sub_value in value.items():
            print(sub_key, ":", sub_value)
    # 其他类型的值处理...

# 输出结果：
# name : John
# age : 30