利用requests發出請求時可能會發生異常，requests中有一個exception庫用來區分這些異常。

http協議是基於tcp/ip協議的，tcp/ip三次握手，因此可以在請求中定義等待時間，超出等待時間仍未到達則請求失敗。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‘

#構建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()
 

requests庫之請求異常處理