第二周作业

作业1：在 MongoDB 中筛选房源

代码：

import pymongo
from bs4 import BeautifulSoup
import requests

client = pymongo.MongoClient('localhost',27017)
xiaozhu = client['xiaozhu']
info = xiaozhu['info']

def get_info (page=1):
    for p in range(1,page+1):
        url='http://bj.xiaozhu.com/search-duanzufang-p{}-0/'.format(p)
        web_data=requests.get(url)
        soup=BeautifulSoup(web_data.text,'lxml')
        titles=soup.select('span.result_title')
        prices=soup.select('span.result_price > i')
        for title,price in zip (titles,prices):
            data={
                'title':title.get_text(),
                'price':int(price.get_text())
            }
            info.insert_one(data)
    print('数据采集完成！')

#get_info(3)

for fang in info.find():
    if fang['price'] >= 500:
       print(fang)

数据库内容 筛选结果

总结：熟悉了Mongodb的安装，中间通过搜索解决了自启动的问题。学习了Mongodb的基本用法，插入数据，查询数据

作业2：爬取手机号

代码：

from bs4 import  BeautifulSoup
import requests
import pymongo
import time

client = pymongo.MongoClient('localhost',27017)
tel = client['tel']
url_list = tel['url_list']
tel_list = tel['tel_list']

def get_tel (page=1):
    for p in range(1,page+1):
        url='http://wh.58.com/shoujihao/pn{}/'.format(str(p))
        web_data = requests.get(url)
        soup = BeautifulSoup(web_data.text,'lxml')
        time.sleep(1)
        if  soup.find('a','next'):
            titles = soup.select('a.t > strong.number')
            links = soup.select('a.t')
            for   title,link in zip (titles,links):
                if  link.get('href').rfind('wh.58') != -1:
                    data={
                        'title': title.get_text(),
                        'link': link.get('href').split('?')[0],
                    }
                    url_list.insert_one(data)
                else:
                    pass
        else:
                print('爬不到了')

#get_tel(120)

def get_item_info ():
    for  item in url_list.find():
        url=item['link']
        web_data=requests.get(url)
        soup=BeautifulSoup(web_data.text,'lxml')
        data = {
            'number':item['title'],
            'price':soup.select('.price')[0].text.strip(),
        }
        tel_list.insert_one(data)
    print('完成')

get_item_info()

爬地址存数据库结果 爬详细信息数据库结果，只是练习没爬详细信息

总结：先爬地址，存数据再爬详细信息

作业三：设置断点续传

再上一个作业上小改

def get_item_info ():
    db_urls = [item['link'] for item in url_list.find()]
    index_urls = [item['url'] for item in tel_list.find()]
    x = set(db_urls)
    y = set(index_urls)
    rest_urls = x - y
    for  url in rest_urls:
        web_data=requests.get(url)
        soup=BeautifulSoup(web_data.text,'lxml')
        data = {
            'number':item['title'],
            'price':soup.select('.price')[0].text.strip(),
            'url':url,
        }
        tel_list.insert_one(data)
    print('完成')