urllib.request--urllib2

================  urllib2 (py2)库的使用  
================ py3是urllib.request 其他使用一样

import urllib.request


headers={
   ‘User-Agent‘:‘......‘}

request=urllib2.Request(‘http://www.baidu.com‘,headers=headers)  # request 对象

response=urllib2.urlopen(request)                                # response 对象

html=response.read()


response.read()
response.getcode()
response.geturl()
response.info()  # 的响应信息

import urllib.request
import random

url=‘http://www.baidu.com‘

UA_list=[‘User-Agent:Mozilla/5.0(Macintosh;IntelMacOSX10_7_0)AppleWebKit/535.11(KHTML,likeGecko)Chrome/17.0.963.56Safari/535.11‘,
         ‘User-Agent:Mozilla/5.0(Macintosh;U;IntelMacOSX10_6_8;en-us)AppleWebKit/534.50(KHTML,likeGecko)Version/5.1Safari/534.50‘,
         ‘User-Agent:Mozilla/5.0(Windows;U;WindowsNT6.1;en-us)AppleWebKit/534.50(KHTML,likeGecko)Version/5.1Safari/534.50‘,
         ‘User-Agent:Mozilla/5.0(compatible;MSIE9.0;WindowsNT6.1;Trident/5.0‘,
         ‘User-Agent:Mozilla/4.0(compatible;MSIE8.0;WindowsNT6.0;Trident/4.0)‘,
         ‘User-Agent:Mozilla/4.0(compatible;MSIE7.0;WindowsNT6.0)‘,
         ‘User-Agent:Mozilla/5.0(Macintosh;IntelMacOSX10.6;rv:2.0.1)Gecko/20100101Firefox/4.0.1‘,
         ‘User-Agent:Opera/9.80(Macintosh;IntelMacOSX10.6.8;U;en)Presto/2.8.131Version/11.11‘,
         ‘User-Agent:Opera/9.80(WindowsNT6.1;U;en)Presto/2.8.131Version/11.11‘
]

User_agent=random.choice(UA_list)

request = urllib.request.Request(url)

request.add_header(‘User-Agent‘,User_agent)  #  增加请求头   User-Agent

print(request.get_header(‘User-agent‘))     # 获取当前的请求头---User-agent

import urllib.request
import urllib.parse

url=‘https://www.baidu.com/s?‘

keyword={‘kd‘:‘哈哈哈 ‘}#‘kd=嘿嘿嘿‘

print(urllib.parse.urlencode(keyword))  #  urllib.request.quote(string)
                #                         urllib.parse.urlencode(dic)

                                  页面url不变化
# 完整的请求头

h={
"User-Agent":" Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36",
}

post_dic={

"i":keyword,
"from":"AUTO",
"to":"AUTO",
"smartresult":"dict&client=fanyideskweb",
"doctype":"json",
"version":"2.1",
"keyfrom":"fanyi.web",
"ction":"FY_BY_REALTIME",
"typoResult":"true",
}


post_data=urllib.parse.urlencode(post_dic).encode(‘utf-8‘)

request=urllib.request.Request(post_url,data=post_data,headers=h)

response=urllib.request.urlopen(request)

print(response.read().decode(‘utf-8‘))

#   爬虫----数据来源

#   AJAX 方式加载的页面   数据来源一定是 JSON
#   拿到了json 就是 拿到了网页的数据

  Post数据
urllib.request.urlopen(url, data=None, [timeout, ]*, cafile=None, capath=None, cadefault=False, context=None)

urlopen() 的data参数默认为None，当data参数不为空的时候，urlopen()提交方式为Post。

from urllib import parse,request url=r‘https://movie.douban.com/j/chart/top_list?type=11&interval_id=100%3A90&action=‘ headers={"User-Agent": "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36"} # ------抓包工具获取----
post_data={
# "type":"11",
# "interval_id":"100:90",
# "action":"",
"start":"0",
"limit":"20"}

post_data=parse.urlencode(post_data).encode(‘utf-8‘)   #  post的数据必须是字节码

my_request=request.Request(url,data=post_data,headers=headers)
my_response=request.urlopen(my_request)

print(my_response.read().decode(‘utf-8‘))   # 解码