python3实现抓取网页资源的 N 种方法（内附200GPython学习资料）-白红宇

这两天学习了python3实现抓取网页资源的方法，发现了很多种方法，所以，今天添加一点小笔记。

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import urllib.requestresponse = urllib.request.urlopen('http://python.org/')html = response.read()复制代码

2、使用 Request

import urllib.request  req = urllib.request.Request('http://python.org/')response = urllib.request.urlopen(req)the_page = response.read()复制代码

3、发送数据

#! /usr/bin/env python3  import urllib.parseimport urllib.request  url = 'http://localhost/login.php'user_agent = 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)'values = {     'act' : 'login',     'login[email]' : 'yzhang@i9i8.com',     'login[password]' : '123456'     }  data = urllib.parse.urlencode(values)req = urllib.request.Request(url, data)req.add_header('Referer', 'http://www.python.org/')response = urllib.request.urlopen(req)the_page = response.read()  print(the_page.decode("utf8"))复制代码

4、发送数据和header

#! /usr/bin/env python3  import urllib.parseimport urllib.request  url = 'http://localhost/login.php'user_agent = 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)'values = {     'act' : 'login',     'login[email]' : 'yzhang@i9i8.com',     'login[password]' : '123456'     }headers = { 'User-Agent' : user_agent }  data = urllib.parse.urlencode(values)req = urllib.request.Request(url, data, headers)response = urllib.request.urlopen(req)the_page = response.read()  print(the_page.decode("utf8"))复制代码

5、http 错误

#! /usr/bin/env python3  import urllib.request  req = urllib.request.Request('http://www.python.org/fish.html')try:  urllib.request.urlopen(req)except urllib.error.HTTPError as e:  print(e.code)  print(e.read().decode("utf8"))复制代码

6、异常处理1

#! /usr/bin/env python3  from urllib.request import Request, urlopenfrom urllib.error import URLError, HTTPErrorreq = Request("http://twitter.com/")try:  response = urlopen(req)except HTTPError as e:  print('The server couldn\'t fulfill the request.')  print('Error code: ', e.code)except URLError as e:  print('We failed to reach a server.')  print('Reason: ', e.reason)else:  print("good!")  print(response.read().decode("utf8"))复制代码

7、异常处理2

#! /usr/bin/env python3  from urllib.request import Request, urlopenfrom urllib.error import URLErrorreq = Request("http://twitter.com/")try:  response = urlopen(req)except URLError as e:  if hasattr(e, 'reason'):    print('We failed to reach a server.')    print('Reason: ', e.reason)  elif hasattr(e, 'code'):    print('The server couldn\'t fulfill the request.')    print('Error code: ', e.code)else:  print("good!")  print(response.read().decode("utf8"))复制代码

8、HTTP 认证

#! /usr/bin/env python3 import urllib.request # create a password managerpassword_mgr = urllib.request.HTTPPasswordMgrWithDefaultRealm() # Add the username and password.# If we knew the realm, we could use it instead of None.top_level_url = "https://cms.tetx.com/"password_mgr.add_password(None, top_level_url, 'yzhang', 'cccddd') handler = urllib.request.HTTPBasicAuthHandler(password_mgr) # create "opener" (OpenerDirector instance)opener = urllib.request.build_opener(handler) # use the opener to fetch a URLa_url = "https://cms.tetx.com/"x = opener.open(a_url)print(x.read()) # Install the opener.# Now all calls to urllib.request.urlopen use our opener.urllib.request.install_opener(opener) a = urllib.request.urlopen(a_url).read().decode('utf8')print(a)复制代码

9、使用代理

#! /usr/bin/env python3  import urllib.request  proxy_support = urllib.request.ProxyHandler({
   'sock5': 'localhost:1080'})opener = urllib.request.build_opener(proxy_support)urllib.request.install_opener(opener)   a = urllib.request.urlopen("http://g.cn").read().decode("utf8")print(a)复制代码

10、超时

#! /usr/bin/env python3  import socketimport urllib.request  # timeout in secondstimeout = 2socket.setdefaulttimeout(timeout)  # this call to urllib.request.urlopen now uses the default timeout# we have set in the socket modulereq = urllib.request.Request('http://twitter.com/')a = urllib.request.urlopen(req).read()print(a)复制代码

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