Python請求異常處理：如何獲取更詳細的（用戶友好的）錯誤消息？

Question

讓我們假設我有一些功能：

def get_result(url): 
    try: 
     return requests.get(url, headers={'User-Agent': random.choice(USER_AGENTS)}).text 
    except requests.exceptions.ConnectionError as e: 
     message = 'Connection to {0} failed. \n {1}' 
     print message.format(url, e) 
     sys.exit(0) 

案例＃1 「URL語法錯誤」 URL = 'http://google'

... 
connection to http://google failed. 
HTTPConnectionPool(host='google', port=80): Max retries exceeded with url:/(Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x7fd417ece350>: Failed to establish a new connection: [Errno -5] No address associated with hostname',)) 
... 

案例＃2 「不存在的網址」 url ='http://smth_non_existing.com'

... 
connection to http://smth_non_existing.com failed. 
HTTPConnectionPool(host='smth_non_existing.com', port=80): Max retries exceeded with url:/(Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x7fe196d4a3d0>: Failed to establish a new connection: [Errno -2] Name or service not known',)) 
... 

所以我只想打印錯誤消息的'最後部分'。在第一種情況下「沒有地址與主機名相關」和第二個「名稱或服務不知道」

Answer 1

我發現，你需要短信 - e.args[0].args[1].args[1]。它尚不清楚，但它打印：

Connection to http://google failed. 
No address associated with hostname 

代碼：

def get_result(url): 
    try: 
     return requests.get(url, headers={'User-Agent': random.choice(USER_AGENTS)}).text 
    except requests.exceptions.ConnectionError as e: 
     message = 'Connection to {0} failed. \n {1}' 
     print message.format(url, e.args[0].args[1].args[1]) 
     sys.exit(0)