urllib.request;urllib.parser;urllib.error;urllib.

requests库优于urllib，其基于urllib。

urllib个人基本掌握。

#urllib.request
r=urllib.request.urlopen('http://www.cnblogs.com/realmonkeykingsun/')
print(r.read().decode('utf-8))

#urllib.parser
data=(urllib.parser.urlencode({'world':'hello'}),encoding='utf-8)
r=urllib.request.urlopen('http://www.cnblogs.com/realmonkeykingsun/','data=data)

#urllib.error
try:
    r=urllib.request.urlopen('http://www.cnblogs.com/realmonkeykingsun/',timeout=0.1)
except urllib.error.URLErrur as e:
 print(e)

Request

import urllib.request
request=urllib.request.Request(url=url,data=data,header=header)
r=urlllib.request.urlopen(request)

Handler

#代理
import urllib.request
proxy_handler=urllib.request.ProxyHandler({'http':'http://127.0.1:9743'}
opener=urllib.request.build_opener(proxy_handler)
r=opener.open('http://www.baidu.com')

#Cookie
import http.cookiejar,urllib.request
cookie=http:cookiejar.CookieJar()
handler=urllib.request.HTTPCookieProcessor(cookie)
opener=urllib.request.build_opener(handler)
r=opener.open("http")
for item in cookie:
     print(item.name+"="item.value)

URL解析

#urlparser urlunparse
result=urlparse("http")

data=['http','user','a-6']
urlunparse(data)

#urljon
urljoin(h1,h2)

#urlencode
params={'name':'germey','age':'23'}
base_url='http1‘
url=base_url+urlencode（params）