urllib

Problem When screen-scraping a webpage using python one has to know the character encoding of the page. If you get the character encoding wrong than your output will be messed up. People usually use some rudimentary technique to detect the encoding. They either use the charset from the header or the charset defined in the meta tag or they use an encoding detector (which does not care about meta tags or headers). By using only one these techniques, sometimes you will not get the same result as you would in a browser. Browsers do it this way: Meta tags always takes precedence (or xml definition)

Why does the code below work only with multiprocessing.dummy , but not with simple multiprocessing . import urllib.request #from multiprocessing.dummy import Pool #this works from multiprocessing import Pool urls = ['http://www.python.org', 'http://www.yahoo.com','http://www.scala.org', 'http://www.google.com'] if __name__ == '__main__': with Pool(5) as p: results = p.map(urllib.request.urlopen, urls) Error : Traceback (most recent call last): File "urlthreads.py", line 31, in <module> results = p.map(urllib.request.urlopen, urls) File "C:\Users\patri\Anaconda3\lib\multiprocessing\pool.py",

urllib是python内置的HTTP请求库，无需安装即可使用，它包含了4个模块： request：它是最基本的http请求模块，用来模拟发送请求 error：异常处理模块，如果出现错误可以捕获这些异常 parse：一个工具模块，提供了许多URL处理方法，如：拆分、解析、合并等 robotparser：主要用来识别网站的robots.txt文件，然后判断哪些网站可以爬 1、urllib.request.urlopen() urllib.request.urlopen(url,data=None,[timeout,],cafile=None,capath=None,cadefault=False,context=None) 请求对象，返回一个HTTPResponse类型的对象，包含的方法和属性： 方法：read()、readinto()、getheader(name)、getheaders()、fileno() 属性：msg、version、status、reason、bebuglevel、closed import urllib.request response=urllib.request.urlopen('https://www.python.org') #请求站点获得一个HTTPResponse对象 #print(response.read().decode('utf-8'

In my project I'm handling all HTTP requests with python requests library . Now, I need to query the http server using specific DNS - there are two environments, each using its own DNS, and changes are made independently. So, when the code is running, it should use DNS specific to the environment, and not the DNS specified in my internet connection. Has anyone tried this using python-requests? I've only found solution for urllib2: https://stackoverflow.com/questions/4623090/python-set-custom-dns-server-for-urllib-requests requests uses urllib3 , which ultimately uses httplib.HTTPConnection as

Proxyhandler 处理器（代理） 使用方法： urllib.request.Proxyhandle 传入一个代理，这个代理是一个字典，字典的关键字key依赖于代理能够接受的类型（http\https）， 值是一个套接字。 使用创建的 hander 以及 ruquest.build_opener() 创建一个opener。 使用opener调用open函数，发起请求 示例代码如下： from urllib import request url = “www.baidu.com” # 创建一个 handler handler = request.Proxyhandler(["http":"233.241.25.25:3375"]) # 使用handler 创建一个opener opener = request.build_opener(handler) # 使用opener打开open方法 resp = opener.open(url) print(resp.read()) http.cookiejar库之CookieJar CookieJar和HTTPCookieProcessor 我们在使用爬虫的时候，经常会用到cookie进行模拟登陆和访问。在使用urllib库做爬虫，我们需要借助 http.cookiejar 库中的 CookieJar 来实现。