如何利用python对HTTP代理进行自动化维护？

importrequestsfrombs4importBeautifulSoupimporttimeclassProxyPool:
def__init__(self, url, headers):
self.url=urlself.headers=headersself.proxies= []
self.timeout=5defget_proxies(self):
response=requests.get(self.url, headers=self.headers)
soup=BeautifulSoup(response.text, 'html.parser')
table=soup.find('table', {'id': 'ip_list'})
tr_list=table.find_all('tr')
fortrintr_list[1:]:
td_list=tr.find_all('td')
ip=td_list[1].textport=td_list[2].textprotocol=td_list[5].text.lower()
self.proxies.append({'protocol': protocol, 'ip': ip, 'port': port})
defverify_proxies(self):
forproxyinself.proxies:
try:
proxies= {
proxy['protocol']: '{}://{}:{}'.format(proxy['protocol'], proxy['ip'], proxy['port'])
                }
response=requests.get('http://httpbin.org/get', proxies=proxies, timeout=self.timeout)
ifresponse.status_code!=200:
self.proxies.remove(proxy)
except:
self.proxies.remove(proxy)
defget_valid_proxies(self):
self.get_proxies()
self.verify_proxies()
returnself.proxiesif__name__=='__main__':
url='HTTP代理网站'headers= {
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3'    }
proxy_pool=ProxyPool(url, headers)
whileTrue:
proxies=proxy_pool.get_valid_proxies()
print('Valid proxies:', proxies)
time.sleep(60)