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Python爬虫学习记录——18.58同城出租信息抓取

奋斗De奶爸 2022-09-06 阅读 81
Scrapyidemongodb58同城编程语言


文章目录

  • ​​爬虫整体流程​​
  • ​​实战​​

爬虫整体流程

Python爬虫学习记录——18.58同城出租信息抓取_Scrapy

实战

  1. 58同城抓取流程
  1. 进入成都小区页面（https://cd.58.com/xiaoqu/），确定抓取目标
  2. 观察页面，获取各行政区的链接
  3. 分行政区抓取各小区的URL
  4. 进入各小区详情页面，抓取名字、价格、地址、年份等信息
  5. 抓取小区二手房页面第一页的价格，在管道中求该小区房价的平均价格
  6. 抓取小区出租房页面第一页的URL，进入详情页抓取名称、价格、房型等信息
    需要抓取的有：
  1. 各行政区下的小区列表的小区URL
  2. 小区详情页中该小区的名字、价格、地址、年份等信息
  3. 各小区二手房页面的二手房每平米价格，并在管道中计算出小区真实平均房价
  4. 各小区租房页面列表中每个租房房源的URL
  5. 每个租房房源的详情页中，该房源的名称、价格、房型等信息
  2. 58同城抓取代码模块示意图：

    3. Python爬虫学习记录——18.58同城出租信息抓取_mongodb_02

  3. 代码实现
  1. 创建scrapy文件，命名为city_58，并创建爬虫文件spider_city_58

>>> scrapy startproject city_58 
>>> cd city_58 
>>> scrapy genspider spider_city_58 58.com

  1. 编写items.py文件，这个文件主要负责定义具体项目的内容

import scrapy


class City58Item(scrapy.Item):
    # define the fields for your item here like:
    name = scrapy.Field()
    price = scrapy.Field()
    last_updated = scrapy.Field()


class City58ItemXiaoQu(scrapy.Item):
    id = scrapy.Field()
    name = scrapy.Field()
    reference_price = scrapy.Field()
    address = scrapy.Field()
    times = scrapy.Field()


class City58ItemXiaoChuZuQuInfo(scrapy.Item):
    id = scrapy.Field()  
    name = scrapy.Field()
    zu_price = scrapy.Field()
    type = scrapy.Field()
    mianji = scrapy.Field()
    chuzu_price_pre = scrapy.Field()
    url = scrapy.Field()
    price_pre = scrapy.Field()

  1. 在city_58文件夹下创建utils文件夹，文件夹下创建一个parse.py文件，parse.py共有5个函数，分别负责匹配列表页所有的小区url，小区的详情页信息，二手房的详情页信息，出租页面详情页的url，出租页面详情页

# code:utf8
from pyquery import PyQuery


def parse(response):
    """
    抓取小区列表页面： http://cd.58.com/xiaoqu/11487/
    返回列表页所有的小区url
    :param:response
    :return
    """
    jpy = PyQuery(response.text)

    tr_list = jpy('#infolist > div.listwrap > table > tbody > tr').items()

    result = set()  #result为set集合（不允许重复元素）
    for tr in tr_list:
        url = tr(' td.info > ul > li.tli1 > a').attr('href')  #爬取各个小区的url
        result.add(url)

    return result


def xiaoqu_parse(response):
    """
    小区详情页匹配代码样例url:http://cd.58.com/xiaoqu/shenxianshudayuan/
    返回这个小区的详细信息的dict字典，主要信息包括小区名称，小区参考房价，小区地址，小区建筑年代
    :param:response
    :return:
    """

    result = dict()
    jpy = PyQuery(response.text)
    result['name'] = jpy('body > div.bodyItem.bheader > div > h1 > span').text()
    result['reference_price'] = jpy('body > div.bodyItem.bheader > div > dl > dd:nth-child(1) > span.moneyColor').text()
    result['address'] = jpy('body > div.bodyItem.bheader > div > dl > dd:nth-child(3) > span.ddinfo')\
        .text().replace('查看地图', '')   #得到地址详情，去除“查看地图”，如 “ 紫荆西路6号 查看地图”，将“查看地图”替换为“”
    result['times'] = jpy('body > div.bodyItem.bheader > div > dl > dd:nth-child(5)').text().split()
    result['times'] = result['times'][2]  #取出建筑年代
    return result


def get_ershou_price_list(response):
    """
    页面链接样例:http://cd.58.com/xiaoqu/shenxianshudayuan/ershoufang/
    匹配二手房列表页面的所有房价信息
    返回一个价格的列表list
    :param:response
    :return:
    """

    jpy = PyQuery(response.text)
    price_tag = jpy('td.tc > span:nth-child(3)').text().split()
    price_tag = [i[:-3] for i in price_tag]   #遍历price_tag截取到倒数第三个元素
    return price_tag


def chuzu_list_pag_get_detail_url(response):
    """
    页面链接样例:http://cd.58.com/xiaoqu/shenxianshudayuan/chuzu/
    获取出租列表页所有详情页url
    返回一个url的列表list
    :param:response
    :return:
    """
    jpy = PyQuery(response.text)
    a_list = jpy('tr > td.t > a.t').items()
    url_list = [a.attr('href') for a in a_list]  #遍历a_list
    return url_list


def get_chuzu_house_info(response):
    """
    获取出租详情页的相关信息
    返回一个dict包含：出租页标题，出租价格，房屋面积，房屋类型（几室几厅）
    :param:response
    :return:
    """
    jpy = PyQuery(response.text)
    result = dict()
    result['name'] = jpy('body > div.main-wrap > div.house-title > h1').text()
    result['zu_price'] = jpy('body > div.main-wrap > div.house-basic-info > div.house-basic-right.fr > '
                          'div.house-basic-desc > div.house-desc-item.fl.c_333 > div > span.c_ff552e > b').text()

    result['type'] = jpy('body > div.main-wrap > div.house-basic-info > div.house-basic-right.fr > div.house-basic-desc'
                         ' > div.house-desc-item.fl.c_333 > ul > li:nth-child(2) > span:nth-child(2)').text()

    result['type'], result['mianji'], *_ = result['type'].split()
    return result


if __name__ == '__main__':
    import requests
    r = requests.get('http://cd.58.com/zufang/31995551807162x.shtml')
    get_chuzu_house_info(r)

  1. 编写spider_city_58.py，这个文件主要负责网页的爬取以及网页之间的跳转

# -*- coding: utf-8 -*-
import scrapy    #导入scrapy包
from scrapy.http import Request  #导入Request包
from ..utils.parse import parse, \    #从utils文件夹中导入parse文件中的这些类
    xiaoqu_parse, get_ershou_price_list, \
    chuzu_list_pag_get_detail_url,\
    get_chuzu_house_info
from ..items import City58ItemXiaoQu, City58ItemXiaoChuZuQuInfo  #从items文件导入这些类

from traceback import format_exc


class SpiderCity58Spider(scrapy.Spider):
    name = 'spider_city_58'
    allowed_domains = ['58.com']
    host = 'cd.58.com'
    xianqu_url_format = 'http://{}/xiaoqu/{}/'
    # xianqu_code = list()
    xianqu_code = list(range(103, 118))
    xianqu_code.append(21611)

    def start_requests(self):   #重写start_requests函数
        start_urls = ['http://{}/xiaoqu/{}/'.format(self.host, code) for code in self.xianqu_code]    
        for url in start_urls:
            yield Request(url)    #遍历所有区域

    def parse(self, response):

        """
        第一步抓取所有的小区
        http://cd.58.com/xiaoqu/21611/
        :param response:
        :return:
        """

        url_list = parse(response)   #调用utils文件夹中parse文件中的parse方法，得到所有小区的url

        for url in url_list:
            yield Request(url,
                          callback=self.xiaoqu_detail_pag,   #回调xiaoqu_detail_pag方法
                          errback=self.error_back,
                          priority=4
                          )



    def xiaoqu_detail_pag(self, response):

        """
        第二步抓取小区详情页信息
        http://cd.58.com/xiaoqu/shenxianshudayuan/
        :param response:
        :return:
        """

        _ = self
        data = xiaoqu_parse(response)
        item = City58ItemXiaoQu()
        item.update(data)
        item['id'] = response.url.split('/')[4]
        yield item

        # 二手房
        url = 'http://{}/xiaoqu/{}/ershoufang/'.format(self.host, item['id'])
        yield Request(url,
                      callback=self.ershoufang_list_pag,  #回调ershoufang_list_pag方法
                      errback=self.error_back,
                      meta={'id': item['id']},
                      priority=3)

        # 出租房
        url_ = 'http://{}/xiaoqu/{}/chuzu/'.format(self.host, item['id'])

        yield Request(url_,
                      callback=self.chuzu_list_pag,  #回调chuzu_list_pag方法
                      errback=self.error_back,
                      meta={'id': item['id']},
                      priority=2)

    def ershoufang_list_pag(self, response):

        """
        第三步抓取二手房详情页信息
        http://cd.58.com/xiaoqu/shenxianshudayuan/ershoufang/
        :param response:
        :return:
        """

        _ = self
        price_list = get_ershou_price_list(response)

        yield {'id': response.meta['id'], 'price_list': price_list}



    def chuzu_list_pag(self, response):

        """
        第四步抓取出租房详情页url
        http://cd.58.com/xiaoqu/shenxianshudayuan/chuzu/
        :param response:
        :return:
        """

        _ = self
        url_list = chuzu_list_pag_get_detail_url(response)

        for url in url_list:
            yield response.request.replace(url=url, callback=self.chuzu_detail_pag, priority=1)  #回调chuzu_detail_pag方法
            # yield Request(url, callback=)

    def chuzu_detail_pag(self, response):

        """
        第五步抓取出租房详情页信息
        :param response:
        :return:
        """

        _ = self
        data = get_chuzu_house_info(response)
        item = City58ItemXiaoChuZuQuInfo()
        item.update(data)
        item['id'] = response.meta['id']
        item['url'] = response.url
        yield item

    def error_back(self, e):
        _ = e
        self.logger.error(format_exc())  #打出报错信息

  1. 编写middleware.py 文件，这个文件主要负责挂代理，防止封IP
    可以在网上寻找免费的代理IP，也可以购买高质量的代理IP

from scrapy import signals

#from .utils.proxy_swift import proxy_pool


class ProxyMiddleware(object):

    def process_request(self, request, spider):
        #传入代理服务器，下面语句需要替换为自己的代理方式
        request.meta['proxy'] = 'http://{}'.format(proxy_pool.pop())
        print()

    def process_response(self, request, response, spider):
        return response


    def process_exception(self, request, exception, spider):
        pass

  1. 编写pipeline.py，这个文件主要负责数据处理以及数据入库

from scrapy.exceptions import DropItem
from pymongo import MongoClient
from scrapy.conf import settings
from pymongo.errors import DuplicateKeyError
from traceback import format_exc
from .items import City58ItemXiaoQu, City58ItemXiaoChuZuQuInfo


class City58Pipeline(object):

    def __init__(self, mongo_uri, mongo_db):
        self.mongo_uri = mongo_uri
        self.mongo_db = mongo_db
        self.client = None
        self.db = None

    @classmethod
    def from_crawler(cls, crawler):
        return cls(
            mongo_uri=crawler.settings.get('MONGODB_URI'),   #提取出了mongodb配置
            mongo_db=settings.get('MONGODB_DATABASE', 'items')   
        )

    def open_spider(self, spider):
        _ = spider
        self.client = MongoClient(self.mongo_uri)  #连接数据库
        self.db = self.client[self.mongo_db]
        self.db['city58_info'].ensure_index('id', unique=True)  #在表city58_info中建立索引，并保证索引的唯一性
        self.db['city58_chuzu_info'].ensure_index('url', unique=True)   #在表city58_chuzu_info中建立索引，并保证索引的唯一性

    def close_spider(self, spider):
        _ = spider
        self.client.close()  #关闭数据库

    def process_item(self, item, spider):
        try:
            if isinstance(item, City58ItemXiaoQu):    #判断是否是小区的item
                self.db['city58_info'].update({'id': item['id']}, {'$set': item}, upsert=True)   #通过id判断，有就更新，没有就插入
            elif isinstance(item, City58ItemXiaoChuZuQuInfo): #判断是否是小区出租信息的item
                try:
                    fangjia = HandleFangjiaPipline.price_per_square_meter_dict[item['id']]  #把HandleFangjiaPipline管道的字典price_per_square_meter_dict中每平米平均价格赋值给fangjia
                    # del HandleFangjiaPipline.price_per_square_meter_dict[item['id']]
                    item['price_pre'] = fangjia   #赋值给item

                    self.db['city58_chuzu_info'].update({'url': item['url']}, {'$set': item}, upsert=True)   #通过url判断，有就更新，没有就插入
                except Exception as e:
                    print(e)   #打印错误

        except DuplicateKeyError:
            spider.logger.debug(' duplicate key error collection')  #唯一键冲突报错
        except Exception as e:
            _ = e
            spider.logger.error(format_exc())
        return item


class HandleZuFangPipline(object):

    def process_item(self, item, spider):
        _ = spider, self
        # self.db[self.collection_name].insert_one(dict(item))
        if isinstance(item, City58ItemXiaoChuZuQuInfo) and 'mianji' in item:  #判断进来的item是否是City58ItemXiaoChuZuQuInfo，是否含有面积参数
            item['chuzu_price_pre'] = int(item['zu_price']) / int(item['mianji'])   #租金除以面积得到平均价格
        return item  #继续传递item


class HandleFangjiaPipline(object):

    price_per_square_meter_dict = dict()  #声明一个dict()

    def process_item(self, item, spider):
        _ = spider

        if isinstance(item, dict) and 'price_list' in item:  #判断传进来的item是否是个字典，并且是否含有price_list
            item['price_list'] = [int(i) for i in item['price_list']]  #遍历price_list
            if item['price_list']:
                self.price_per_square_meter_dict[item['id']] = sum(item['price_list']) / len(item['price_list'])  #得到每个小区的平均价格
            else:
                self.price_per_square_meter_dict[item['id']] = 0
            raise DropItem()
        return item  #继续传递item

  1. 编写settings.py，这个文件主要负责激活管道和中间件，制定管道的顺序

# -*- coding: utf-8 -*-

# Scrapy settings for city_58 project
#
# For simplicity, this file contains only settings considered important or
# commonly used. You can find more settings consulting the documentation:
#
#     http://doc.scrapy.org/en/latest/topics/settings.html
#     http://scrapy.readthedocs.org/en/latest/topics/downloader-middleware.html
#     http://scrapy.readthedocs.org/en/latest/topics/spider-middleware.html

BOT_NAME = 'city_58'

SPIDER_MODULES = ['city_58.spiders']
NEWSPIDER_MODULE = 'city_58.spiders'


# Crawl responsibly by identifying yourself (and your website) on the user-agent
#USER_AGENT = 'city_58 (+http://www.yourdomain.com)'

# Obey robots.txt rules
ROBOTSTXT_OBEY = True

# Configure maximum concurrent requests performed by Scrapy (default: 16)
#CONCURRENT_REQUESTS = 32

# Configure a delay for requests for the same website (default: 0)
# See http://scrapy.readthedocs.org/en/latest/topics/settings.html#download-delay
# See also autothrottle settings and docs
DOWNLOAD_DELAY = 0.3   #下载速度
# The download delay setting will honor only one of:
#CONCURRENT_REQUESTS_PER_DOMAIN = 16
#CONCURRENT_REQUESTS_PER_IP = 16

# Disable cookies (enabled by default)
#COOKIES_ENABLED = False

# Disable Telnet Console (enabled by default)
#TELNETCONSOLE_ENABLED = False

# Override the default request headers:
#DEFAULT_REQUEST_HEADERS = {
#   'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
#   'Accept-Language': 'en',
#}

# Enable or disable spider middlewares
# See http://scrapy.readthedocs.org/en/latest/topics/spider-middleware.html
#SPIDER_MIDDLEWARES = {
#    'city_58.middlewares.City58SpiderMiddleware': 543,
#}

# Enable or disable downloader middlewares
# See http://scrapy.readthedocs.org/en/latest/topics/downloader-middleware.html
DOWNLOADER_MIDDLEWARES = {
   'city_58.middlewares.ProxyMiddleware': 543,   #代理中间件
}

# Enable or disable extensions
# See http://scrapy.readthedocs.org/en/latest/topics/extensions.html
#EXTENSIONS = {
#    'scrapy.extensions.telnet.TelnetConsole': None,
#}

# Configure item pipelines
# See http://scrapy.readthedocs.org/en/latest/topics/item-pipeline.html

   #先进行数据处理，再进行数据入库
ITEM_PIPELINES = {
   'city_58.pipelines.HandleZuFangPipline': 300,    #  租房平均每平米价格
   'city_58.pipelines.HandleFangjiaPipline': 310,   #小区平均价格
   'city_58.pipelines.City58Pipeline': 320,   #储存入库
}

# Enable and configure the AutoThrottle extension (disabled by default)
# See http://doc.scrapy.org/en/latest/topics/autothrottle.html
#AUTOTHROTTLE_ENABLED = True
# The initial download delay
#AUTOTHROTTLE_START_DELAY = 5
# The maximum download delay to be set in case of high latencies
#AUTOTHROTTLE_MAX_DELAY = 60
# The average number of requests Scrapy should be sending in parallel to
# each remote server
#AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0
# Enable showing throttling stats for every response received:
#AUTOTHROTTLE_DEBUG = False

# Enable and configure HTTP caching (disabled by default)
# See http://scrapy.readthedocs.org/en/latest/topics/downlo,mhader-middleware.html#httpcache-middleware-settings
#HTTPCACHE_ENABLED = True
#HTTPCACHE_EXPIRATION_SECS = 0
#HTTPCACHE_DIR = 'httpcache'
#HTTPCACHE_IGNORE_HTTP_CODES = []
#HTTPCACHE_STORAGE = 'scrapy.extensions.httpcache.FilesystemCacheStorage'


MONGODB_HOST = '127.0.0.1'   #本地数据库
MONGODB_PORT = '27017'    #数据库端口
MONGODB_URI = 'mongodb://{}:{}'.format(MONGODB_HOST, MONGODB_PORT) 
MONGODB_DATABASE = 'test'  #数据库名字


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