python实现列表页数据的批量抓取练手练手的

python实现列表页数据的批量抓取，练手的，下回带分页的

#!/usr/bin/env python

# coding=utf-8

import requests

from bs4 import BeautifulSoup

import pymysql

import sys, io

sys.stdout = io.TextIOWrapper(sys.stdout.buffer,encoding='utf8') # Change default encoding to utf8

print('连接到mysql服务器...')

db = pymysql.connect("localhost","root","root","python")

print('连接上了!')

cursor = db.cursor()

hdrs = {'User-Agent':'Mozilla/5.0 (X11; Fedora; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko)'}

url = "http://www.zztez.com/tezgl/"

r = requests.get(url, headers = hdrs)

soup = BeautifulSoup(r.content.decode('gbk', 'ignore'), 'lxml')

def has_class_but_no_id(tag):

    return tag.has_attr('title') and tag.has_attr('href') and not tag.has_attr('target')

urls = []

for link in soup.find_all(has_class_but_no_id):

            url="http://www.zztez.com" + link.get('href')

            r = requests.get(url, headers = hdrs)

            soup = BeautifulSoup(r.content.decode('gbk', 'ignore'), 'lxml')

            title=soup.find("h1")

            title=title.string.encode("utf-8")

            intro=soup.select(".intro")

            rintro=intro[0].string.encode("utf-8")

            content=soup.select(".content")

            rcontent=content[0].encode("utf-8")

            #查询数据

            sql="SELECT count(*) as total FROM article WHERE title like %s"

            data=(title)

            row_affected=cursor.execute(sql,data)

            one=cursor.fetchone()

            if one==(0,):

                insert = ("INSERT INTO article(title,intro,content)" "VALUES(%s,%s,%s)")

                data = (title, rintro, rcontent)

                cursor.execute(insert, data)

                db.commit()

print('爬取数据并插入mysql数据库完成...')