[英]How to check if there is internet connection
我必須檢查我的計算機是否已連接到互聯網(因此,如果我打開瀏覽器,我可以或我不能訪問URL),為此我嘗試了一些代碼:
首先是
import socket
def internet_on():
try:
print("checking internet connection..")
socket.setdefaulttimeout(5)
host = socket.gethostbyname("www.google.com")
s = socket.create_connection((host, 80), 2)
s.close()
print('internet on.')
return True
except Exception as e:
print(e)
print("internet off.")
return False
internet_on()
我從此答案中獲取的代碼使用Python檢查互聯網連接
在我嘗試過之后:
from urllib.request import urlopen
def internet_on():
try:
urlopen("https://www.instagram.com/", timeout=5)
return True
except Exception as err:
print(str(err))
return False
internet_on()
我從此答案中獲取的代碼檢查網絡連接
和這個
import socket
REMOTE_SERVER = "www.google.com"
def internet_on(hostname):
try:
# see if we can resolve the host name -- tells us if there is
# a DNS listening
host = socket.gethostbyname(hostname)
# connect to the host -- tells us if the host is actually
# reachable
s = socket.create_connection((host, 80), 2)
return True
except Exception:
return False
internet_on(REMOTE_SERVER)
我從此答案中獲取的代碼測試python中是否存在互聯網連接
如果連接處於活動狀態,則代碼可以正常工作,但是當沒有連接時,所有這些代碼都會引發相同的錯誤:
Traceback (most recent call last):
File "C:\Users\mcara\PycharmProjects\1\venv\lib\site-packages\urllib3\connection.py", line 159, in _new_conn
(self._dns_host, self.port), self.timeout, **extra_kw)
File "C:\Users\mcara\PycharmProjects\1\venv\lib\site-packages\urllib3\util\connection.py", line 57, in create_connection
for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
File "C:\Program Files\Python37-32\lib\socket.py", line 748, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno 11001] getaddrinfo failed
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\mcara\PycharmProjects\1\venv\lib\site-packages\urllib3\connectionpool.py", line 600, in urlopen
chunked=chunked)
File "C:\Users\mcara\PycharmProjects\1\venv\lib\site-packages\urllib3\connectionpool.py", line 343, in _make_request
self._validate_conn(conn)
File "C:\Users\mcara\PycharmProjects\1\venv\lib\site-packages\urllib3\connectionpool.py", line 839, in _validate_conn
conn.connect()
File "C:\Users\mcara\PycharmProjects\1\venv\lib\site-packages\urllib3\connection.py", line 301, in connect
conn = self._new_conn()
File "C:\Users\mcara\PycharmProjects\1\venv\lib\site-packages\urllib3\connection.py", line 168, in _new_conn
self, "Failed to establish a new connection: %s" % e)
urllib3.exceptions.NewConnectionError: <urllib3.connection.VerifiedHTTPSConnection object at 0x03B39E90>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\mcara\PycharmProjects\1\venv\lib\site-packages\requests\adapters.py", line 449, in send
timeout=timeout
File "C:\Users\mcara\PycharmProjects\1\venv\lib\site-packages\urllib3\connectionpool.py", line 638, in urlopen
_stacktrace=sys.exc_info()[2])
File "C:\Users\mcara\PycharmProjects\1\venv\lib\site-packages\urllib3\util\retry.py", line 398, in increment
raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='www.instagram.com', port=443): Max retries exceeded with url: /_exploreurself (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x03B39E90>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed'))
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:/Users/mcara/OneDrive/Desktop/file InstaBot da editare/v0.4/bot.py", line 835, in <module>
bot.unfollow_process(RANDOM, sense=UP_DOWN, following_target=0, sleep_time=60)
File "C:/Users/mcara/OneDrive/Desktop/file InstaBot da editare/v0.4/bot.py", line 651, in unfollow_process
current_following = self.user_following_num(self._username)
File "C:/Users/mcara/OneDrive/Desktop/file InstaBot da editare/v0.4/bot.py", line 387, in user_following_num
r = requests.get(url).text
File "C:\Users\mcara\PycharmProjects\1\venv\lib\site-packages\requests\api.py", line 75, in get
return request('get', url, params=params, **kwargs)
File "C:\Users\mcara\PycharmProjects\1\venv\lib\site-packages\requests\api.py", line 60, in request
return session.request(method=method, url=url, **kwargs)
File "C:\Users\mcara\PycharmProjects\1\venv\lib\site-packages\requests\sessions.py", line 533, in request
resp = self.send(prep, **send_kwargs)
File "C:\Users\mcara\PycharmProjects\1\venv\lib\site-packages\requests\sessions.py", line 646, in send
r = adapter.send(request, **kwargs)
File "C:\Users\mcara\PycharmProjects\1\venv\lib\site-packages\requests\adapters.py", line 516, in send
raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPSConnectionPool(host='www.instagram.com', port=443): Max retries exceeded with url: /_exploreurself (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x03B39E90>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed'))
嘗試使用庫“ subprocess” (下面的代碼示例)對www.google.com執行ping操作 。 此解決方案是一種間接解決方案,但有時最好在系統命令中委派以完成諸如此類的某些工作。
import subprocess
def my_dir(my_path):
output=''
try:
p = subprocess.Popen('ping '+my_path, stdout = subprocess.PIPE, stderr = subprocess.STDOUT,
#close_fds = True, #not valid for Windows platforms
shell = True
)
output, err = p.communicate()
#print(output)
finally:
if p is not None:
try: p.kill()
except: pass
return output
print(my_dir('www.google.com'))
然后,您可以解析其輸出,以了解您是否已到達Google的服務器。
在此處嘗試使用此IP地址216.58.192.142
是Google的IP地址之一。 由於IP地址是靜態的,因此該代碼不夠可靠,因此可能無法始終正常運行,因此,請使用您認為響應速度更快的其他網站替換此IP地址。
代碼使用固定IP地址而不是完全限定域名(FQDN)的原因是因為FQDN需要進行DNS查找。 當計算機沒有可用的Internet連接時,DNS查找本身可能會阻止對urllib_request.urlopen的調用超過一秒鍾。
import urllib2
def internet_on():
try:
urllib2.urlopen('http://216.58.192.142', timeout=1)
return True
except urllib2.URLError as err:
return False
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.