python爬虫获取数据后存入MySQL数据库中

from urllib.request import urlopen
import re
import numpy
import time
import pymysql
from bs4 import BeautifulSoup

def getHtmlContent(url):
    html = urlopen(url)
    bsobj = BeautifulSoup(html,"lxml",from_encoding = "gb18030")
    tablelist = bsobj.findAll("tr")

    #用户名：root 密码：123456 数据库名：aqi-changsha
    db = pymysql.connect("localhost","root","123456","aqi-changsha",charset="utf8")
    cursor = db.cursor()
    
    date = time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time()))#获取当前时间
    date1 = ("insert into date values (%s)")
    try:
        cursor.execute(date1,date)
        db.commit(); #提交操作
    except:
        db.rollback();
        
    for datalist in tablelist[1:]:
        data = datalist.get_text().replace(" ","").replace("\r\n","").strip("\n").split("\n")
        data.append(date)
        data.append("0")
        try:
            insert_data = ("insert into aqi values (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)")
            cursor.execute(insert_data,data)
            db.commit();
        except:
            db.rollback()
          
    db.close()
    
def main():
    url = "http://www.tianqihoubao.com/aqi/changsha.html"
    getHtmlContent(url)
  
if __name__ == "__main__":
    main()