编写python爬虫采集彩票网站数据，将数据写入mongodb数据库

1.准备工作：

1.1安装requests: cmd >> pip install requests

1.2 安装lxml: cmd >>  pip install lxml

1.3安装wheel: cmd >>  pip install wheel

1.4 安装xlwt: cmd >> pip install xlwt

1.5 安装pymongo: cmd >> pip install pymongo

完整代码

import requests
from lxml import etree
import xlwt
from pymongo import MongoClient

#设置浏览器的请求头，告诉服务器我们是从浏览器来的，作用是阻止被网站反爬
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36',
    'Accept-Encoding': 'gzip, deflate',
    'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3',
    'Connection': 'keep-alive'
}

# 创建数据库
client = MongoClient()
database = client['Chapter6']
collection = database['webdata']

for i in range(1, 21):
    url = "http://kaijiang.zhcw.com/zhcw/html/3d/list_{}.html".format(i)
    #发送请求 得到数据
    response = requests.get(url=url,headers=headers)
    #print(response.text)

    #将数据改成xpath结构
    res_xpath = etree.HTML(response.text)
    trs = res_xpath.xpath('/html/body/table//tr')

    # 将数据写入MongoDB数据库
    for tr in trs[2:-1]:
        data = {
            '开奖日期': tr.xpath("./td[1]/text()")[0],
            '期号': tr.xpath("./td[2]/text()")[0],
            '中奖号码1': tr.xpath("./td[3]/em[1]/text()")[0],
            '中奖号码2': tr.xpath("./td[3]/em[2]/text()")[0],
            '中奖号码3': tr.xpath("./td[3]/em[3]/text()")[0],
            '销售额(元)': tr.xpath("./td[4]/text()")[0],
            '返奖比例': tr.xpath("./td[5]/text()")[0]
        }
        collection.insert_one(data);

实现效果