这篇教程python urllib库的使用详解写得很实用，希望能帮到您。
相关：urllib是python内置的http请求库，本文介绍urllib三个模块：请求模块urllib.request、异常处理模块urllib.error、url解析模块urllib.parse。
1、请求模块：urllib.request
python2 import urllib2
response = urllib2.urlopen('http://httpbin.org/robots.txt')
python3 import urllib.request
res = urllib.request.urlopen('http://httpbin.org/robots.txt')
urllib.request.urlopen(url, data=None, [timeout, ]*, cafile=None, capath=None, cadefault=False, context=None)
urlopen()方法中的url参数可以是字符串，也可以是一个Request对象
#url可以是字符串import urllib.requestresp = urllib.request.urlopen('http://www.baidu.com')print(resp.read().decode('utf-8')) # read()获取响应体的内容，内容是bytes字节流，需要转换成字符串##url可以也是Request对象import urllib.requestrequest = urllib.request.Request('http://httpbin.org')response = urllib.request.urlopen(request)print(response.read().decode('utf-8'))
data参数：post请求# coding:utf8import urllib.request, urllib.parsedata = bytes(urllib.parse.urlencode({'word': 'hello'}), encoding='utf8')resp = urllib.request.urlopen('http://httpbin.org/post', data=data)print(resp.read())
urlopen()中的参数timeout：设置请求超时时间：# coding:utf8#设置请求超时时间import urllib.requestresp = urllib.request.urlopen('http://httpbin.org/get', timeout=0.1)print(resp.read().decode('utf-8'))
响应类型：# coding:utf8#响应类型import urllib.requestresp = urllib.request.urlopen('http://httpbin.org/get')print(type(resp))
响应的状态码、响应头：# coding:utf8#响应的状态码、响应头import urllib.requestresp = urllib.request.urlopen('http://www.baidu.com')print(resp.status)print(resp.getheaders()) # 数组（元组列表）print(resp.getheader('Server')) # "Server"大小写不区分200
[('Bdpagetype', '1'), ('Bdqid', '0xa6d873bb003836ce'), ('Cache-Control', 'private'), ('Content-Type', 'text/html'), ('Cxy_all', 'baidu+b8704ff7c06fb8466a83df26d7f0ad23'), ('Date', 'Sun, 21 Apr 2019 15:18:24 GMT'), ('Expires', 'Sun, 21 Apr 2019 15:18:03 GMT'), ('P3p', 'CP=" OTI DSP COR IVA OUR IND COM "'), ('Server', 'BWS/1.1'), ('Set-Cookie', 'BAIDUID=8C61C3A67C1281B5952199E456EEC61E:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com'), ('Set-Cookie', 'BIDUPSID=8C61C3A67C1281B5952199E456EEC61E; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com'), ('Set-Cookie', 'PSTM=1555859904; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com'), ('Set-Cookie', 'delPer=0; path=/; domain=.baidu.com'), ('Set-Cookie', 'BDSVRTM=0; path=/'), ('Set-Cookie', 'BD_HOME=0; path=/'), ('Set-Cookie', 'H_PS_PSSID=1452_28777_21078_28775_28722_28557_28838_28584_28604; path=/; domain=.baidu.com'), ('Vary', 'Accept-Encoding'), ('X-Ua-Compatible', 'IE=Edge,chrome=1'), ('Connection', 'close'), ('Transfer-Encoding', 'chunked')]
BWS/1.1
使用代理：urllib.request.ProxyHandler()：# coding:utf8proxy_handler = urllib.request.ProxyHandler({'http': 'http://www.example.com:3128/'})proxy_auth_handler = urllib.request.ProxyBasicAuthHandler()proxy_auth_handler.add_password('realm', 'host', 'username', 'password')opener = urllib.request.build_opener(proxy_handler, proxy_auth_handler)# This time, rather than install the OpenerDirector, we use it directly:resp = opener.open('http://www.example.com/login.html')print(resp.read())
2、异常处理模块：urllib.error
异常处理实例1：# coding:utf8from urllib import error, requesttry: resp = request.urlopen('http://www.blueflags.cn')except error.URLError as e: print(e.reason)
异常处理实例2：# coding:utf8from urllib import error, requesttry: resp = request.urlopen('http://www.baidu.com')except error.HTTPError as e: print(e.reason, e.code, e.headers, sep='/n')except error.URLError as e: print(e.reason)else: print('request successfully')
异常处理实例3：# coding:utf8import socket, urllib.request, urllib.errortry: resp = urllib.request.urlopen('http://www.baidu.com', timeout=0.01)except urllib.error.URLError as e: print(type(e.reason)) if isinstance(e.reason,socket.timeout): print('time out')
3、url解析模块：urllib.parse
parse.urlencode# coding:utf8from urllib import request, parseurl = 'http://httpbin.org/post'headers = { 'Host': 'httpbin.org', 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.109 Safari/537.36'}dict = {'name': 'Germey'}data = bytes(parse.urlencode(dict), encoding='utf8')req = request.Request(url=url, data=data, headers=headers, method='POST')resp = request.urlopen(req)print(resp.read().decode('utf-8')){"args": {},"data": "","files": {},"form": {"name": "Thanlon"},"headers": {"Accept-Encoding": "identity","Content-Length": "12","Content-Type": "application/x-www-form-urlencoded","Host": "httpbin.org","User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.109 Safari/537.36"},"json": null,"origin": "117.136.78.194, 117.136.78.194","url": "https://httpbin.org/post"}
add_header方法添加请求头：# coding:utf8from urllib import request, parseurl = 'http://httpbin.org/post'dict = {'name': 'Thanlon'}data = bytes(parse.urlencode(dict), encoding='utf8')req = request.Request(url=url, data=data, method='POST')req.add_header('User-Agent', 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.109 Safari/537.36')resp = request.urlopen(req)print(resp.read().decode('utf-8'))
parse.urlparse：# coding:utf8from urllib.parse import urlparseresult = urlparse('http://www.baidu.com/index.html;user?id=1#comment')print(type(result))print(result)<class 'urllib.parse.ParseResult'>
ParseResult(scheme='http', netloc='www.baidu.com', path='/index.html', params='user', query='id=1', fragment='comment')
from urllib.parse import urlparseresult = urlparse('www.baidu.com/index.html;user?id=1#comment', scheme='https')print(type(result))print(result)<class 'urllib.parse.ParseResult'>
ParseResult(scheme='https', netloc='', path='www.baidu.com/index.html', params='user', query='id=1', fragment='comment')
# coding:utf8from urllib.parse import urlparseresult = urlparse('http://www.baidu.com/index.html;user?id=1#comment', scheme='https')print(result)ParseResult(scheme='http', netloc='www.baidu.com', path='/index.html', params='user', query='id=1', fragment='comment')
# coding:utf8from urllib.parse import urlparseresult = urlparse('http://www.baidu.com/index.html;user?id=1#comment',allow_fragments=False)print(result)ParseResult(scheme='http', netloc='www.baidu.com', path='/index.html', params='user', query='id=1', fragment='comment')
parse.urlunparse：# coding:utf8from urllib.parse import urlunparsedata = ['http', 'www.baidu.com', 'index.html', 'user', 'name=Thanlon', 'comment']print(urlunparse(data)) 
parse.urljoin：# coding:utf8from urllib.parse import urljoinprint(urljoin('http://www.bai.com', 'index.html'))print(urljoin('http://www.baicu.com', 'https://www.thanlon.cn/index.html'))#以后面为基准
urlencode将字典对象转换成get请求的参数:# coding:utf8from urllib.parse import urlencodeparams = { 'name': 'Thanlon', 'age': 22}baseUrl = 'http://www.thanlon.cn?'url = baseUrl + urlencode(params)print(url)
4、Cookie
cookie的获取(保持登录会话信息)：# coding:utf8#cookie的获取(保持登录会话信息)import urllib.request, http.cookiejarcookie = http.cookiejar.CookieJar()handler = urllib.request.HTTPCookieProcessor(cookie)opener = urllib.request.build_opener(handler)res = opener.open('http://www.baidu.com')for item in cookie: print(item.name + '=' + item.value)
MozillaCookieJar(filename)形式保存cookie# coding:utf8#将cookie保存为cookie.txtimport http.cookiejar, urllib.requestfilename = 'cookie.txt'cookie = http.cookiejar.MozillaCookieJar(filename)handler = urllib.request.HTTPCookieProcessor(cookie)opener = urllib.request.build_opener(handler)res = opener.open('http://www.baidu.com')cookie.save(ignore_discard=True, ignore_expires=True)
LWPCookieJar(filename)形式保存cookie：# coding:utf8import http.cookiejar, urllib.requestfilename = 'cookie.txt'cookie = http.cookiejar.LWPCookieJar(filename)handler = urllib.request.HTTPCookieProcessor(cookie)opener = urllib.request.build_opener(handler)res = opener.open('http://www.baidu.com')cookie.save(ignore_discard=True, ignore_expires=True)
读取cookie请求，获取登陆后的信息# coding:utf8import http.cookiejar, urllib.requestcookie = http.cookiejar.LWPCookieJar()cookie.load('cookie.txt', ignore_discard=True, ignore_expires=True)handler = urllib.request.HTTPCookieProcessor(cookie)opener = urllib.request.build_opener(handler)resp = opener.open('http://www.baidu.com')print(resp.read().decode('utf-8'))以上就是python urllib库的使用详解的详细内容，更多关于python urllib库的资料请关注51zixue.net其它相关文章！
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