python 事件 响应 钩子 even

# -*- coding: utf-8 -*-
import requests

def get_key_info(response, *args, **kwargs):
    """callback function"""
    print response.headers['Content-Type']

def main():
    """
    主程序

    """
    requests.get('Http://www.baidu.com', hooks=dict(response=get_key_info))


main()