python爬虫——爬取链家房价信息（未完待续）

爬取链家房价信息（未完待续）

items.py

# -*- coding: utf-8 -*-# Define here the models for your scraped items## See documentation in:# http://doc.scrapy.org/en/latest/topics/items.htmlimport scrapyclass LianjiaItem(scrapy.Item):info1 = scrapy.Field()#小区名字info1_url = scrapy.Field()#小区主页地址info2 = scrapy.Field()#小区地址info2_dizhi = scrapy.Field()#小区地址info3 = scrapy.Field()#小区地址info4 = scrapy.Field()#小区地址

settings.py

这里仅仅需要注意一个点：

# Obey robots.txt rules
ROBOTSTXT_OBEY = False

这里需要设置为 false 因为有的网站禁止爬虫

# -*- coding: utf-8 -*-# Scrapy settings for lianjia 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.htmlBOT_NAME = 'lianjia'SPIDER_MODULES = ['lianjia.spiders']NEWSPIDER_MODULE = 'lianjia.spiders'# Crawl responsibly by identifying yourself (and your website) on the user-agent#USER_AGENT = 'lianjia (+http://www.yourdomain.com)'# Obey robots.txt rulesROBOTSTXT_OBEY = False# 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 = 3# 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 = {#    'lianjia.middlewares.MyCustomSpiderMiddleware': 543,#}# Enable or disable downloader middlewares# See http://scrapy.readthedocs.org/en/latest/topics/downloader-middleware.html#DOWNLOADER_MIDDLEWARES = {#    'lianjia.middlewares.MyCustomDownloaderMiddleware': 543,#}# 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#ITEM_PIPELINES = {#    'lianjia.pipelines.SomePipeline': 300,#}# 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/downloader-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'

scrapy.py

#coding:utf-8import scrapy,timeimport refrom scrapy.http import Requestfrom lianjia.items import LianjiaItemclass Myspider(scrapy.Spider):name='lianjia'allow_domains=['lianjia.com']base_url='http://bj.lianjia.com/ershoufang/tongzhou/pg'def start_requests(self):for i in range(1,2):url=self.base_url+str(i)yield Request(url,self.parse)def parse(self,response):print response.url items=LianjiaItem()#print response.page_sourcefor info in response.xpath('//div[4]/div[1]/ul/li'):info1= info.xpath('div/div[1]/a/text()').extract_first()info1_url= info.xpath('div/div[1]/a/@href').extract_first()info2= info.xpath('div/div[2]/div/text()').extract_first()info2_dizhi= info.xpath('div/div[3]/div/text()').extract_first()info3= info.xpath('div/div[3]/div/a/text()').extract_first()info4=info.xpath('div/div[4]/text()').extract_first()items['info1']=info1items['info1_url']=info1_urlitems['info2']=info2items['info2_dizhi']=info2_dizhiitems['info3']=info3items['info4']=info4yield Request(info1_url,callback=self.parse_mainurl,meta={'items':items})def parse_mainurl(self,response):items=response.meta['items']print response.urlprint items['info1'],items['info1_url']print items['info2']print items['info2_dizhi'],items['info3']print items['info4']print response.xpath('//div[3]/div/div/a/text()').extract_first()