requests库之请求异常处理

利用requests发出请求时可能会发生异常，requests中有一个exception库用来区分这些异常。

http协议是基于tcp/ip协议的，tcp/ip三次握手，因此可以在请求中定义等待时间，超出等待时间仍未到达则请求失败。如requests.get(url,timeout=(3,7)),requests.get(url,timeout=10)

import json
import requests
from requests import exceptions

URL = 'https://api.github.com'

#构建uri
def build_uri(endpoint):
    return '/'.join([URL,endpoint])

def timeout_request():
    try:
        response = requests.get(build_uri('user/emails'),timeout=5)
        response.raise_for_status()
    except exceptions.Timeout as e:
        print(e)
    except exceptions.HTTPError as e:
        print(e)

if __name__=='__main__':
    timeout_request()