我使用requests库编写了一个简单程序，我想打印的对不起，该URL不存在！'如果输入URL错误。我发现如果我输入伪造的网址
get_request()函数，它将给我一个ConnectionError错误，因此我将其放在except之后：
import requests
def get_request(url):
a = requests.get(url)
return a
myurl = 'https://nberccc.com/videos?page=1' # a fake website url
try:
c = get_request(myurl)
except ConnectionError:
print('sorry, the url does not exist!')
它返回：
---------------------------------------------------------------------------
gaierror Traceback (most recent call last)
C:\ProgramData\Anaconda3\lib\site-packages\urllib3\connection.py in _new_conn(self)
158 conn = connection.create_connection(
--> 159 (self._dns_host, self.port), self.timeout, **extra_kw)
160
C:\ProgramData\Anaconda3\lib\site-packages\urllib3\util\connection.py in create_connection(address, timeout, source_address, socket_options)
56
---> 57 for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
58 af, socktype, proto, canonname, sa = res
C:\ProgramData\Anaconda3\lib\socket.py in getaddrinfo(host, port, family, type, proto, flags)
747 addrlist = []
--> 748 for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
749 af, socktype, proto, canonname, sa = res
gaierror: [Errno 11001] getaddrinfo failed
During handling of the above exception, another exception occurred:
NewConnectionError Traceback (most recent call last)
C:\ProgramData\Anaconda3\lib\site-packages\urllib3\connectionpool.py in urlopen(self, method, url, body, headers, retries, redirect, assert_same_host, timeout, pool_timeout, release_conn, chunked, body_pos, **response_kw)
599 body=body, headers=headers,
--> 600 chunked=chunked)
601
C:\ProgramData\Anaconda3\lib\site-packages\urllib3\connectionpool.py in _make_request(self, conn, method, url, timeout, chunked, **httplib_request_kw)
342 try:
--> 343 self._validate_conn(conn)
344 except (SocketTimeout, BaseSSLError) as e:
C:\ProgramData\Anaconda3\lib\site-packages\urllib3\connectionpool.py in _validate_conn(self, conn)
838 if not getattr(conn, 'sock', None): # AppEngine might not have `.sock`
--> 839 conn.connect()
840
C:\ProgramData\Anaconda3\lib\site-packages\urllib3\connection.py in connect(self)
300 # Add certificate verification
--> 301 conn = self._new_conn()
302 hostname = self.host
C:\ProgramData\Anaconda3\lib\site-packages\urllib3\connection.py in _new_conn(self)
167 raise NewConnectionError(
--> 168 self, "Failed to establish a new connection: %s" % e)
169
NewConnectionError: <urllib3.connection.VerifiedHTTPSConnection object at 0x000001602C18F4E0>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed
During handling of the above exception, another exception occurred:
MaxRetryError Traceback (most recent call last)
C:\ProgramData\Anaconda3\lib\site-packages\requests\adapters.py in send(self, request, stream, timeout, verify, cert, proxies)
448 retries=self.max_retries,
--> 449 timeout=timeout
450 )
C:\ProgramData\Anaconda3\lib\site-packages\urllib3\connectionpool.py in urlopen(self, method, url, body, headers, retries, redirect, assert_same_host, timeout, pool_timeout, release_conn, chunked, body_pos, **response_kw)
637 retries = retries.increment(method, url, error=e, _pool=self,
--> 638 _stacktrace=sys.exc_info()[2])
639 retries.sleep()
C:\ProgramData\Anaconda3\lib\site-packages\urllib3\util\retry.py in increment(self, method, url, response, error, _pool, _stacktrace)
397 if new_retry.is_exhausted():
--> 398 raise MaxRetryError(_pool, url, error or ResponseError(cause))
399
MaxRetryError: HTTPSConnectionPool(host='porndoe111.com', port=443): Max retries exceeded with url: /videos?page=1 (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x000001602C18F4E0>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed'))
During handling of the above exception, another exception occurred:
ConnectionError Traceback (most recent call last)
<ipython-input-37-f61b8d93ce3e> in <module>
1 myurl = 'https://nberccc.com/videos?page=1'
----> 2 requests.get(url)
3
4 def get_request(url):
5 a = requests.get(url)
C:\ProgramData\Anaconda3\lib\site-packages\requests\api.py in get(url, params, **kwargs)
73
74 kwargs.setdefault('allow_redirects', True)
---> 75 return request('get', url, params=params, **kwargs)
76
77
C:\ProgramData\Anaconda3\lib\site-packages\requests\api.py in request(method, url, **kwargs)
58 # cases, and look like a memory leak in others.
59 with sessions.Session() as session:
---> 60 return session.request(method=method, url=url, **kwargs)
61
62
C:\ProgramData\Anaconda3\lib\site-packages\requests\sessions.py in request(self, method, url, params, data, headers, cookies, files, auth, timeout, allow_redirects, proxies, hooks, stream, verify, cert, json)
531 }
532 send_kwargs.update(settings)
--> 533 resp = self.send(prep, **send_kwargs)
534
535 return resp
C:\ProgramData\Anaconda3\lib\site-packages\requests\sessions.py in send(self, request, **kwargs)
644
645 # Send the request
--> 646 r = adapter.send(request, **kwargs)
647
648 # Total elapsed time of the request (approximately)
C:\ProgramData\Anaconda3\lib\site-packages\requests\adapters.py in send(self, request, stream, timeout, verify, cert, proxies)
514 raise SSLError(e, request=request)
515
--> 516 raise ConnectionError(e, request=request)
517
518 except ClosedPoolError as e:
ConnectionError: HTTPSConnectionPool(host='porndoe111.com', port=443): Max retries exceeded with url: /videos?page=1 (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x000001602C18F4E0>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed'))
为什么它不显示我自己的错误消息？
运行此命令时：
myurl1 = 'https://github.com/songxxiao' # a normal website url
try:
c = get_request(myurl1)
except ConnectionError:
print('sorry, the url does not exist!')
效果很好。
那么如何在上面修改我的代码以捕获该错误并打印我自己的错误消息？