python 简单抓取网页并写入excel实例

# -*- coding: UTF-8 -*-
import requests
from bs4 import BeautifulSoup
import xlwt
import time 

#获取第一页的内容
def get_one_page(url):
    headers = {
        'User-Agent':'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36'
    }
    response = requests.get(url,headers=headers)
    if response.status_code == 200:
        return response.text
    return None  

#解析第一页内容，数据结构化
def parse_one_page(html):  

    soup = BeautifulSoup(html,'lxml')
    i = 0
    for item in soup.select('tr')[2:-1]:  

        yield{
            'time':item.select('td')[i].text,
            'issue':item.select('td')[i+1].text,
            'digits':item.select('td em')[0].text,
            'ten_digits':item.select('td em')[1].text,
            'hundred_digits':item.select('td em')[2].text,
            'single_selection':item.select('td')[i+3].text,
            'group_selection_3':item.select('td')[i+4].text,
            'group_selection_6':item.select('td')[i+5].text,
            'sales':item.select('td')[i+6].text,
            'return_rates':item.select('td')[i+7].text
        }  

#将数据写入Excel表格中
def write_to_excel():
    f = xlwt.Workbook()
    sheet1 = f.add_sheet('3D',cell_overwrite_ok=True)
    row0 = ["开奖日期","期号","个位数","十位数","百位数","单数","组选3","组选6","销售额","返奖比例"]
    #写入第一行
    for j in range(0,len(row0)):
        sheet1.write(0,j,row0[j]) 

    #依次爬取每一页内容的每一期信息，并将其依次写入Excel
    i=0
    for k in range(1,247):
        url = 'http://kaijiang.zhcw.com/zhcw/html/3d/list_%s.html' %(str(k))
        html = get_one_page(url)
        print('正在保存第%d页。'%k)
        #写入每一期的信息
        for item in parse_one_page(html):
            sheet1.write(i+1,0,item['time'])
            sheet1.write(i+1,1,item['issue'])
            sheet1.write(i+1,2,item['digits'])
            sheet1.write(i+1,3,item['ten_digits'])
            sheet1.write(i+1,4,item['hundred_digits'])
            sheet1.write(i+1,5,item['single_selection'])
            sheet1.write(i+1,6,item['group_selection_3'])
            sheet1.write(i+1,7,item['group_selection_6'])
            sheet1.write(i+1,8,item['sales'])
            sheet1.write(i+1,9,item['return_rates'])
            i+=1  

    f.save('3D.xls')  

def main():
    write_to_excel()

if __name__ == '__main__':
    main()