import time
import requests

url = 'http://www.google.com.hk'

print(time.strftime('%Y-%m-%d %H:%M:%S'))
try:
  html = requests.get(url, timeout=5).text
  print('success')
except requests.exceptions.RequestException as e:
  print(e)

print(time.strftime('%Y-%m-%d %H:%M:%S'))

r = requests.get('https://github.com', timeout=5)

r = requests.get('https://github.com', timeout=(3.05, 27))

import time
import requests

url_login = 'http://www.heibanke.com/accounts/login/"htmlcode">

def gethtml(url):
  i = 0
  while i < 3:
    try:
      html = requests.get(url, timeout=5).text
      return html
    except requests.exceptions.RequestException:
      i += 1


其实 requests 已经帮我们封装好了。（但是代码好像变多了…）


import time
import requests
from requests.adapters import HTTPAdapter

s = requests.Session()
s.mount('http://', HTTPAdapter(max_retries=3))
s.mount('https://', HTTPAdapter(max_retries=3))

print(time.strftime('%Y-%m-%d %H:%M:%S'))
try:
  r = s.get('http://www.google.com.hk', timeout=5)
  return r.text
except requests.exceptions.RequestException as e:
  print(e)
print(time.strftime('%Y-%m-%d %H:%M:%S'))



max_retries 为最大重试次数，重试3次，加上最初的一次请求，一共是4次，所以上述代码运行耗时是20秒而不是15秒

2018-12-14 15:34:03

HTTPConnectionPool(host='www.google.com.hk', port=80): Max retries exceeded with url: / (Caused by ConnectTimeoutError(<urllib3.connection.HTTPConnection object at 0x0000000013269630>, 'Connection to www.google.com.hk timed out. (connect timeout=5)'))

2018-12-14 15:34:23



以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。