python3 requests获取某网站折线图上数据

　　比如要抓取某网站折线图上数据，如下截图：

　　

　　借助Chrome开发者工具Network。经过分析发现获取上面的热度数据，找到对应的事件url：https://pcw-api.iqiyi.com/video/video/trendcontent?ids=309006000&callback=jsonp_1548834448424_4474

　　

　　

通过分析：https://pcw-api.iqiyi.com/video/video/trendcontent?ids=309006000&callback=jsonp_1548834448424_4474

发现，ids=309006000是个定值，1548834448424_4474是两个随机数

ids=309006000是个定值从网页中获取。

　右键“查看网页源代码” 发现如下：

具体实现代码如下：

import random
from urllib import request
import requests
 
import json
class test:
    def __init__(self):
　　　　　#插入合适的cookie值
        self.mycookies = []
 
        self.user_agent_list = [
            'Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1464.0 Safari/537.36',
            'Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.16 Safari/537.36',
            'Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.3319.102 Safari/537.36',
            'Mozilla/5.0 (X11; CrOS i686 3912.101.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.116 Safari/537.36',
            'Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.93 Safari/537.36',
            'Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1667.0 Safari/537.36',
            'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:17.0) Gecko/20100101 Firefox/17.0.6',
            'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1468.0 Safari/537.36',
            'Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2224.3 Safari/537.36',
            'Mozilla/5.0 (X11; CrOS i686 3912.101.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.116 Safari/537.36'
            ]
 
    def gettvid(self,url):
        tvid = ''
        try:
            cookie1 = random.choice(self.mycookies)
            # print(cookie1)
            UserAgent = random.choice(self.user_agent_list)
            header = {'User-Agent': UserAgent}
            # print(header)
            txt1 = requests.get(url, cookies=cookie1, headers=header).text
            print(txt1)
 
            response = request.urlopen(url)
            page = response.read()
            txt = str(page.decode('utf-8'))
            # cookie1 = random.choice(self.mycookies)
            # txt = requests.get(keyurl, cookies=cookie1).text
            txts = txt.split('\n')
            # print(txts)
            index = len(txts) - 1
            while index > 0:
                t = txts[index]
                if t.find("param['tvid']") > -1:
                    tt = t.replace('"', '').replace(' ', '')
                    start = tt.find("=")+1
                    end = start+9
                    tvid = tt[start:end]
                    tvid = tvid.strip()
                    break
                index -= 1
 
        except Exception as ex:
            print(ex)
            # print(ex)
        return tvid
 
    def gethotdx(self,url):
        tvid =self.gettvid(url)
        # 产生7位随机数
        id1=random.randint(1111111,9999999)
        # 产生5为随机数
        id2 = random.randint(11111, 99999)
        link ='https://pcw-api.iqiyi.com/video/video/trendcontent?ids=%s&callback=jsonp_154881%d_%d'%(tvid,id1,id2)
        try:
            cookie1 = random.choice(self.mycookies)
            # print(cookie1)
            UserAgent = random.choice(self.user_agent_list)
            header = {'User-Agent': UserAgent}
            # print(header)
            txt = requests.get(link, cookies=cookie1, headers=header).text
 
            start = txt.find('(') + 1
            end = txt.find(")")
            jsonstr = txt[start:end]
            data_json = json.loads(jsonstr)
            datas = data_json.get('data')[0]
            # print(data_json.get('data'))
 
            id = datas.get('id')
            print(id)
            print('\n')
            #
            # # 热度峰值
            pkHot = datas.get('pkHot')
            print(pkHot)
            print('\n')
            #
            # # 热度峰值 日期
            pkHD = datas.get('pkHD')
            print(pkHD)
            print('\n')
            #
            # # 热度值
            print('30天内容热度')
            aHot = datas.get('aHot')
            # print(aHot)
            for item in aHot:
                print(item.get('k'), item.get('v'))
            print('\n')
 
            print('全部内容热度')
            mHot = datas.get('mHot')
            # print(aHot)
            for item in mHot:
                print(item.get('k'), item.get('v'))
            print('\n')
 
            print('30天播放指数')
            aidx = datas.get('aidx')
            # print(aHot)
            for item in aidx:
                print(item.get('k'), item.get('v'))
            print('\n')
 
            print('全部播放指数')
            midx = datas.get('midx')
            # print(aHot)
            for item in midx:
                print(item.get('k'), item.get('v'))
 
        except Exception as e1:
            print(e1)
 
if __name__=="__main__":
    obj =test()
    url='https://www.iqiyi.com/v_19rrnbwrfg.html?vfm=m_103_txsp'
    obj.gethotdx(url)