使用`requests`来检查域名是否被注册是否准确？

Question

我注意到，请求无效的URL requests.get(invalid_url)抛出以下例外：

Traceback (most recent call last): 
    File "/usr/lib/python3.4/socket.py", line 530, in getaddrinfo 
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags): 
socket.gaierror: [Errno -2] Name or service not known 

During handling of the above exception, another exception occurred: 
    File "/usr/lib/python3/dist-packages/urllib3/connectionpool.py", line 607, in urlopen 
    raise MaxRetryError(self, url, e) 
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='sparkandshine.me', port=80): Max retries exceeded with url:/(Caused by <class 'socket.gaierror'>: [Errno -2] Name or service not known) 

During handling of the above exception, another exception occurred: 
    File "/usr/lib/python3/dist-packages/requests/adapters.py", line 378, in send 
    raise ConnectionError(e) 
requests.exceptions.ConnectionError: HTTPConnectionPool(host='sparkandshine.me', port=80): Max retries exceeded with url:/(Caused by <class 'socket.gaierror'>: [Errno -2] Name or service not known) 

是否精确确定一个域名是否被捕获这些例外注册与否？这里是源代码：

#!/usr/bin/env python3 
import http 
import urllib3 
import requests 

url = 'http://example.com' 
try : 
    r = requests.get(url) 
except (http.client.HTTPException, urllib3.exceptions.MaxRetryError, requests.exceptions.ConnectionError): 
    print(url) #this domain name is not registered? 

Answer 1

否;对域进行注册并且没有根域名的IP地址是非常好的，更不用说让服务器在该IP地址的端口80上运行。

Answer 2

正如@tripleee所说，它不是很精确。我找到另一种方法来确定域名是否已注册，使用Python模块pywhois。

要安装它，

pip install python-whois 

下面是一个例子。

#!/usr/bin/env python 
import whois 

url = 'example.com' 
try : 
    w = whois.whois(url) 
except (whois.parser.PywhoisError): 
    print(url) 

PS：不支持python3。