【python爬虫专项（28）】链家二手房源数据采集1（分页信息采集）

链家二手房源信息采集

这里以采集 ​​北京二手房源​​ 为例，要进行获取的字段如下

爬虫逻辑：【分页url获取】–> 【页面列表数据的获取】

函数式编程：

函数1：get_urls(city_url,n) → 【分页网页url获取】函数
         city_url：不同城市起始网址
         n：页数参数

函数2：get_data(ui,d_h,table) → 【数据采集及mongo入库】函数
         ui：数据信息网页
         d_h：user-agent信息
         table：mongo集合对象

前期准备及封装第一个函数

导入库和代码分区

import requests
import time
from bs4 import BeautifulSoup
import pymongo

if __name__ == '__main__':

查找分页url规律
一般查找该页面下面的2-4页即可

u2 = https://bj.lianjia.com/ershoufang/pg2/
u3 = https://bj.lianjia.com/ershoufang/pg3/
u4 = https://bj.lianjia.com/ershoufang/pg4/
......

封装第一个函数，返回分页url列表

def get_urls(city_url,n):
'''【分页网页url获取】函数
city_url：不同城市起始网址
n：页数参数
'''
lst = []
for i in range(1,n+1):
lst.append(city_url + f'pg{i}/')
return lst

print(get_urls('https://bj.lianjia.com/ershoufang/',5))

输出结果为：

[‘https://bj.lianjia.com/ershoufang/pg1/’,
‘https://bj.lianjia.com/ershoufang/pg2/’,
‘https://bj.lianjia.com/ershoufang/pg3/’,
‘https://bj.lianjia.com/ershoufang/pg4/’,
‘https://bj.lianjia.com/ershoufang/pg5/’]

向网站发送请求

在获取网址后要检测一下是否可以进行数据的获取，以第一个页面的url为例（记得提前配置好headers和cookies），代码如下

dic_headers = {'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36'}

cookies = "TY_SESSION_ID=a63a5c48-ee8a-411b-b774-82b887a09de9; lianjia_uuid=1e4ed8ae-d689-4d12-a788-2e93397646fd; _smt_uid=5dbcff46.49fdcd46; UM_distinctid=16e2a452be0688-0c84653ae31a8-e343166-1fa400-16e2a452be1b5b; _jzqy=1.1572667207.1572667207.1.jzqsr=baidu|jzqct=%E9%93%BE%E5%AE%B6.-; _ga=GA1.2.1275958388.1572667209; _jzqx=1.1572671272.1572671272.1.jzqsr=sh%2Elianjia%2Ecom|jzqct=/ershoufang/pg2l1/.-; select_city=310000; lianjia_ssid=a2a11c0a-c451-43aa-879e-0d202a663a5d; Hm_lvt_9152f8221cb6243a53c83b956842be8a=1582085114; CNZZDATA1253492439=1147125909-1572665418-https%253A%252F%252Fsp0.baidu.com%252F%7C1582080390; CNZZDATA1254525948=626340744-1572665293-https%253A%252F%252Fsp0.baidu.com%252F%7C1582083769; CNZZDATA1255633284=176672440-1572665274-https%253A%252F%252Fsp0.baidu.com%252F%7C1582083985; CNZZDATA1255604082=1717363940-1572665282-https%253A%252F%252Fsp0.baidu.com%252F%7C1582083899; sensorsdata2015jssdkcross=%7B%22distinct_id%22%3A%2216e2a452d07c03-0d376ce6817042-e343166-2073600-16e2a452d08ab2%22%2C%22%24device_id%22%3A%2216e2a452d07c03-0d376ce6817042-e343166-2073600-16e2a452d08ab2%22%2C%22props%22%3A%7B%22%24latest_traffic_source_type%22%3A%22%E7%9B%B4%E6%8E%A5%E6%B5%81%E9%87%8F%22%2C%22%24latest_referrer%22%3A%22%22%2C%22%24latest_referrer_host%22%3A%22%22%2C%22%24latest_search_keyword%22%3A%22%E6%9C%AA%E5%8F%96%E5%88%B0%E5%80%BC_%E7%9B%B4%E6%8E%A5%E6%89%93%E5%BC%80%22%2C%22%24latest_utm_source%22%3A%22baidu%22%2C%22%24latest_utm_medium%22%3A%22pinzhuan%22%2C%22%24latest_utm_campaign%22%3A%22sousuo%22%2C%22%24latest_utm_content%22%3A%22biaotimiaoshu%22%2C%22%24latest_utm_term%22%3A%22biaoti%22%7D%7D; _qzjc=1; _jzqa=1.941285633448461200.1572667207.1572671272.1582085116.3; _jzqc=1; _jzqckmp=1; _gid=GA1.2.1854019821.1582085121; Hm_lpvt_9152f8221cb6243a53c83b956842be8a=1582085295; _qzja=1.476033730.1572667206855.1572671272043.1582085116087.1582085134003.1582085295034.0.0.0.14.3; _qzjb=1.1582085116087.4.0.0.0; _qzjto=4.1.0; _jzqb=1.4.10.1582085116.1"
dic_cookies = {}
for i in cookies.split('; '):
dic_cookies[i.split("=")[0]] = i.split("=")[1]

r = requests.get('https://bj.lianjia.com/ershoufang/pg1/',headers = dic_headers, cookies = dic_cookies)
print(r)

输出结果为：（当结果返回200时候，说明网页可以正常进行数据获取）

<Response [200]>

查找每个字段对应的标签并获取数据

这里以第一页的第一个表单里包含的信息进行查找试错，如下

标题字段对应的标签

地址对应的标签

详情对应的标签

关注及发布时间对应的标签

总价和单价对应的标签

获取标签内容

r = requests.get('https://bj.lianjia.com/ershoufang/pg1/',headers = dic_headers, cookies = dic_cookies)
soup = BeautifulSoup(r.text,'lxml')
dic = {}
dic['标题'] = soup.find('div',class_="title").a.text
info1 = soup.find('div',class_="positionInfo").text
dic['小区'] = info1.split(" - ")[0]
dic['地址'] = info1.split(" - ")[1]
info2 = soup.find('div', class_="houseInfo").text
dic['户型'] = info2.split(" | ")[0]
dic['面积'] = info2.split(" | ")[1]
dic['朝向'] = info2.split(" | ")[2]
dic['装修类型'] = info2.split(" | ")[3]
dic['楼层'] = info2.split(" | ")[4]
dic['建筑完工时间'] = info2.split(" | ")[5]
dic['是否为板房'] = info2.split(" | ")[6]
info3 = soup.find('div',class_="followInfo").text
dic['关注量'] = info3.split(" / ")[0]
dic['发布时间'] = info3.split(" / ")[1]
dic['总价'] = soup.find('div', class_="totalPrice").text
dic['单价'] = soup.find('div', class_="unitPrice").text.replace('单价','')
dic['链接'] = soup.find('div',class_="title").a['href']
print(dic)

输出结果为：

封装第二个函数

在进行试错无误后，就可以进行函数的封装

配置数据库

myclient = pymongo.MongoClient("mongodb://localhost:27017/")
db = myclient['链家二手房_1']
datatable = db['data_1']
#datatable.delete_many({}) 如果该表格下有数据的话可以使用这条语句

封装函数

def get_data(ui,d_h,d_c,table):
'''【数据采集及mongo入库】函数
ui：数据信息网页
d_h：user-agent信息
table：mongo集合对象
'''
ri = requests.get(ui,headers = d_h,cookies = d_c)
soupi = BeautifulSoup(ri.text, 'lxml')
lis = soupi.find('ul',class_="sellListContent").find_all("li")
n = 0
for li in lis:
dic = {}
dic['标题'] = li.find('div',class_="title").text
info1 = li.find('div',class_="positionInfo").text
dic['小区'] = info1.split(" - ")[0]
dic['地址'] = info1.split(" - ")[1]
info2 = li.find('div', class_="houseInfo").text
dic['户型'] = info2.split(" | ")[0]
dic['面积'] = info2.split(" | ")[1]
dic['朝向'] = info2.split(" | ")[2]
dic['装修类型'] = info2.split(" | ")[3]
dic['楼层'] = info2.split(" | ")[4]
dic['建筑完工时间'] = info2.split(" | ")[5]
dic['是否为板房'] = info2.split(" | ")[6]
info3 = li.find('div',class_="followInfo").text
dic['关注量'] = info3.split(" / ")[0]
dic['发布时间'] = info3.split(" / ")[1]
dic['价钱'] = li.find('div', class_="totalPrice").text
dic['每平米价钱'] = li.find('div', class_="unitPrice").text
dic['房间优势'] = li.find('div', class_="tag").text
dic['链接'] = li.find('a')['href']
table.insert_one(dic)
n += 1
return

可视化输出以及异常处理判断

errorlst = []
count = 0
for u in urllst:
print("程序正在休息......")
time.sleep(5)
try:
count += get_data(urllst[0],dic_headers,dic_cookies,datatable)
print(f'成功采集{count}条数据')
except:
errorlst.append(u)
print('数据采集失败，网址为：',u)

输出的结果如下：