Maison > Article > développement back-end > Crawler Python : Comment obtenir des informations sur les locations en ville ?
Idée : Commencez avec un robot d'exploration monothread, testez qu'il peut analyser avec succès, puis optimisez-le en multi -threading, et enfin enregistrez-le est uniquement à des fins d'apprentissage. Pour éviter de mettre trop de pression sur le site Web, veuillez modifier le numéro dans le code par un nombre plus petit et changer le fil de discussion par un nombre plus petit
1. Unique. -threaded crawler# 用session取代requests # 解析库使用bs4 # 并发库使用concurrent import requests # from lxml import etree # 使用xpath解析 from bs4 import BeautifulSoup from urllib import parse import re import time headers = { 'referer': 'https://zz.zu.fang.com/', 'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36', 'cookie': 'global_cookie=ffzvt3kztwck05jm6twso2wjw18kl67hqft; city=zz; integratecover=1; __utma=147393320.427795962.1613371106.1613371106.1613371106.1; __utmc=147393320; __utmz=147393320.1613371106.1.1.utmcsr=zz.fang.com|utmccn=(referral)|utmcmd=referral|utmcct=/; __utmt_t0=1; __utmt_t1=1; __utmt_t2=1; ASP.NET_SessionId=aamzdnhzct4i5mx3ak4cyoyp; Rent_StatLog=23d82b94-13d6-4601-9019-ce0225c092f6; Captcha=61584F355169576F3355317957376E4F6F7552365351342B7574693561766E63785A70522F56557370586E3376585853346651565256574F37694B7074576B2B34536C5747715856516A4D3D; g_sourcepage=zf_fy%5Elb_pc; unique_cookie=U_ffzvt3kztwck05jm6twso2wjw18kl67hqft*6; __utmb=147393320.12.10.1613371106' } data={ 'agentbid':'' } session = requests.session() session.headers = headers # 获取页面 def getHtml(url): try: re = session.get(url) re.encoding = re.apparent_encoding return re.text except: print(re.status_code) # 获取页面总数量 def getNum(text): soup = BeautifulSoup(text, 'lxml') txt = soup.select('.fanye .txt')[0].text # 取出“共**页”中间的数字 num = re.search(r'\d+', txt).group(0) return num # 获取详细链接 def getLink(tex): soup=BeautifulSoup(text,'lxml') links=soup.select('.title a') for link in links: href=parse.urljoin('https://zz.zu.fang.com/',link['href']) hrefs.append(href) # 解析页面 def parsePage(url): res=session.get(url) if res.status_code==200: res.encoding=res.apparent_encoding soup=BeautifulSoup(res.text,'lxml') try: title=soup.select('div .title')[0].text.strip().replace(' ','') price=soup.select('div .trl-item')[0].text.strip() block=soup.select('.rcont #agantzfxq_C02_08')[0].text.strip() building=soup.select('.rcont #agantzfxq_C02_07')[0].text.strip() try: address=soup.select('.trl-item2 .rcont')[2].text.strip() except: address=soup.select('.trl-item2 .rcont')[1].text.strip() detail1=soup.select('.clearfix')[4].text.strip().replace('\n\n\n',',').replace('\n','') detail2=soup.select('.clearfix')[5].text.strip().replace('\n\n\n',',').replace('\n','') detail=detail1+detail2 name=soup.select('.zf_jjname')[0].text.strip() buserid=re.search('buserid: \'(\d+)\'',res.text).group(1) phone=getPhone(buserid) print(title,price,block,building,address,detail,name,phone) house = (title, price, block, building, address, detail, name, phone) info.append(house) except: pass else: print(re.status_code,re.text) # 获取代理人号码 def getPhone(buserid): url='https://zz.zu.fang.com/RentDetails/Ajax/GetAgentVirtualMobile.aspx' data['agentbid']=buserid res=session.post(url,data=data) if res.status_code==200: return res.text else: print(res.status_code) return if __name__ == '__main__': start_time=time.time() hrefs=[] info=[] init_url = 'https://zz.zu.fang.com/house/' num=getNum(getHtml(init_url)) for i in range(0,num): url = f'https://zz.zu.fang.com/house/i3{i+1}/' text=getHtml(url) getLink(text) print(hrefs) for href in hrefs: parsePage(href) print("共获取%d条数据"%len(info)) print("共耗时{}".format(time.time()-start_time)) session.close()#🎜 🎜#2. Optimiser pour un robot multi-thread# 用session取代requests # 解析库使用bs4 # 并发库使用concurrent import requests # from lxml import etree # 使用xpath解析 from bs4 import BeautifulSoup from concurrent.futures import ThreadPoolExecutor from urllib import parse import re import time headers = { 'referer': 'https://zz.zu.fang.com/', 'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36', 'cookie': 'global_cookie=ffzvt3kztwck05jm6twso2wjw18kl67hqft; integratecover=1; city=zz; keyWord_recenthousezz=%5b%7b%22name%22%3a%22%e6%96%b0%e5%af%86%22%2c%22detailName%22%3a%22%22%2c%22url%22%3a%22%2fhouse-a014868%2f%22%2c%22sort%22%3a1%7d%2c%7b%22name%22%3a%22%e4%ba%8c%e4%b8%83%22%2c%22detailName%22%3a%22%22%2c%22url%22%3a%22%2fhouse-a014864%2f%22%2c%22sort%22%3a1%7d%2c%7b%22name%22%3a%22%e9%83%91%e4%b8%9c%e6%96%b0%e5%8c%ba%22%2c%22detailName%22%3a%22%22%2c%22url%22%3a%22%2fhouse-a0842%2f%22%2c%22sort%22%3a1%7d%5d; __utma=147393320.427795962.1613371106.1613558547.1613575774.5; __utmc=147393320; __utmz=147393320.1613575774.5.4.utmcsr=zz.fang.com|utmccn=(referral)|utmcmd=referral|utmcct=/; ASP.NET_SessionId=vhrhxr1tdatcc1xyoxwybuwv; g_sourcepage=zf_fy%5Elb_pc; Captcha=4937566532507336644D6557347143746B5A6A6B4A7A48445A422F2F6A51746C67516F31357446573052634562725162316152533247514250736F72775566574A2B33514357304B6976343D; __utmt_t0=1; __utmt_t1=1; __utmt_t2=1; __utmb=147393320.9.10.1613575774; unique_cookie=U_0l0d1ilf1t0ci2rozai9qi24k1pkl9lcmrs*4' } data={ 'agentbid':'' } session = requests.session() session.headers = headers # 获取页面 def getHtml(url): res = session.get(url) if res.status_code==200: res.encoding = res.apparent_encoding return res.text else: print(res.status_code) # 获取页面总数量 def getNum(text): soup = BeautifulSoup(text, 'lxml') txt = soup.select('.fanye .txt')[0].text # 取出“共**页”中间的数字 num = re.search(r'\d+', txt).group(0) return num # 获取详细链接 def getLink(url): text=getHtml(url) soup=BeautifulSoup(text,'lxml') links=soup.select('.title a') for link in links: href=parse.urljoin('https://zz.zu.fang.com/',link['href']) hrefs.append(href) # 解析页面 def parsePage(url): res=session.get(url) if res.status_code==200: res.encoding=res.apparent_encoding soup=BeautifulSoup(res.text,'lxml') try: title=soup.select('div .title')[0].text.strip().replace(' ','') price=soup.select('div .trl-item')[0].text.strip() block=soup.select('.rcont #agantzfxq_C02_08')[0].text.strip() building=soup.select('.rcont #agantzfxq_C02_07')[0].text.strip() try: address=soup.select('.trl-item2 .rcont')[2].text.strip() except: address=soup.select('.trl-item2 .rcont')[1].text.strip() detail1=soup.select('.clearfix')[4].text.strip().replace('\n\n\n',',').replace('\n','') detail2=soup.select('.clearfix')[5].text.strip().replace('\n\n\n',',').replace('\n','') detail=detail1+detail2 name=soup.select('.zf_jjname')[0].text.strip() buserid=re.search('buserid: \'(\d+)\'',res.text).group(1) phone=getPhone(buserid) print(title,price,block,building,address,detail,name,phone) house = (title, price, block, building, address, detail, name, phone) info.append(house) except: pass else: print(re.status_code,re.text) # 获取代理人号码 def getPhone(buserid): url='https://zz.zu.fang.com/RentDetails/Ajax/GetAgentVirtualMobile.aspx' data['agentbid']=buserid res=session.post(url,data=data) if res.status_code==200: return res.text else: print(res.status_code) return if __name__ == '__main__': start_time=time.time() hrefs=[] info=[] init_url = 'https://zz.zu.fang.com/house/' num=getNum(getHtml(init_url)) with ThreadPoolExecutor(max_workers=5) as t: for i in range(0,num): url = f'https://zz.zu.fang.com/house/i3{i+1}/' t.submit(getLink,url) print("共获取%d个链接"%len(hrefs)) print(hrefs) with ThreadPoolExecutor(max_workers=30) as t: for href in hrefs: t.submit(parsePage,href) print("共获取%d条数据"%len(info)) print("耗时{}".format(time.time()-start_time)) session.close()3 Utilisez asyncio pour optimiser davantage# 用session取代requests # 解析库使用bs4 # 并发库使用concurrent import requests # from lxml import etree # 使用xpath解析 from bs4 import BeautifulSoup from concurrent.futures import ThreadPoolExecutor from urllib import parse import re import time import asyncio headers = { 'referer': 'https://zz.zu.fang.com/', 'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36', 'cookie': 'global_cookie=ffzvt3kztwck05jm6twso2wjw18kl67hqft; integratecover=1; city=zz; keyWord_recenthousezz=%5b%7b%22name%22%3a%22%e6%96%b0%e5%af%86%22%2c%22detailName%22%3a%22%22%2c%22url%22%3a%22%2fhouse-a014868%2f%22%2c%22sort%22%3a1%7d%2c%7b%22name%22%3a%22%e4%ba%8c%e4%b8%83%22%2c%22detailName%22%3a%22%22%2c%22url%22%3a%22%2fhouse-a014864%2f%22%2c%22sort%22%3a1%7d%2c%7b%22name%22%3a%22%e9%83%91%e4%b8%9c%e6%96%b0%e5%8c%ba%22%2c%22detailName%22%3a%22%22%2c%22url%22%3a%22%2fhouse-a0842%2f%22%2c%22sort%22%3a1%7d%5d; __utma=147393320.427795962.1613371106.1613558547.1613575774.5; __utmc=147393320; __utmz=147393320.1613575774.5.4.utmcsr=zz.fang.com|utmccn=(referral)|utmcmd=referral|utmcct=/; ASP.NET_SessionId=vhrhxr1tdatcc1xyoxwybuwv; g_sourcepage=zf_fy%5Elb_pc; Captcha=4937566532507336644D6557347143746B5A6A6B4A7A48445A422F2F6A51746C67516F31357446573052634562725162316152533247514250736F72775566574A2B33514357304B6976343D; __utmt_t0=1; __utmt_t1=1; __utmt_t2=1; __utmb=147393320.9.10.1613575774; unique_cookie=U_0l0d1ilf1t0ci2rozai9qi24k1pkl9lcmrs*4' } data={ 'agentbid':'' } session = requests.session() session.headers = headers # 获取页面 def getHtml(url): res = session.get(url) if res.status_code==200: res.encoding = res.apparent_encoding return res.text else: print(res.status_code) # 获取页面总数量 def getNum(text): soup = BeautifulSoup(text, 'lxml') txt = soup.select('.fanye .txt')[0].text # 取出“共**页”中间的数字 num = re.search(r'\d+', txt).group(0) return num # 获取详细链接 def getLink(url): text=getHtml(url) soup=BeautifulSoup(text,'lxml') links=soup.select('.title a') for link in links: href=parse.urljoin('https://zz.zu.fang.com/',link['href']) hrefs.append(href) # 解析页面 def parsePage(url): res=session.get(url) if res.status_code==200: res.encoding=res.apparent_encoding soup=BeautifulSoup(res.text,'lxml') try: title=soup.select('div .title')[0].text.strip().replace(' ','') price=soup.select('div .trl-item')[0].text.strip() block=soup.select('.rcont #agantzfxq_C02_08')[0].text.strip() building=soup.select('.rcont #agantzfxq_C02_07')[0].text.strip() try: address=soup.select('.trl-item2 .rcont')[2].text.strip() except: address=soup.select('.trl-item2 .rcont')[1].text.strip() detail1=soup.select('.clearfix')[4].text.strip().replace('\n\n\n',',').replace('\n','') detail2=soup.select('.clearfix')[5].text.strip().replace('\n\n\n',',').replace('\n','') detail=detail1+detail2 name=soup.select('.zf_jjname')[0].text.strip() buserid=re.search('buserid: \'(\d+)\'',res.text).group(1) phone=getPhone(buserid) print(title,price,block,building,address,detail,name,phone) house = (title, price, block, building, address, detail, name, phone) info.append(house) except: pass else: print(re.status_code,re.text) # 获取代理人号码 def getPhone(buserid): url='https://zz.zu.fang.com/RentDetails/Ajax/GetAgentVirtualMobile.aspx' data['agentbid']=buserid res=session.post(url,data=data) if res.status_code==200: return res.text else: print(res.status_code) return # 获取详细链接的线程池 async def Pool1(num): loop=asyncio.get_event_loop() task=[] with ThreadPoolExecutor(max_workers=5) as t: for i in range(0,num): url = f'https://zz.zu.fang.com/house/i3{i+1}/' task.append(loop.run_in_executor(t,getLink,url)) # 解析页面的线程池 async def Pool2(hrefs): loop=asyncio.get_event_loop() task=[] with ThreadPoolExecutor(max_workers=30) as t: for href in hrefs: task.append(loop.run_in_executor(t,parsePage,href)) if __name__ == '__main__': start_time=time.time() hrefs=[] info=[] task=[] init_url = 'https://zz.zu.fang.com/house/' num=getNum(getHtml(init_url)) loop = asyncio.get_event_loop() loop.run_until_complete(Pool1(num)) print("共获取%d个链接"%len(hrefs)) print(hrefs) loop.run_until_complete(Pool2(hrefs)) loop.close() print("共获取%d条数据"%len(info)) print("耗时{}".format(time.time()-start_time)) session.close()4. base de données
from sqlalchemy import create_engine from sqlalchemy import String, Integer, Column, Text from sqlalchemy.orm import sessionmaker from sqlalchemy.orm import scoped_session # 多线程爬虫时避免出现线程安全问题 from sqlalchemy.ext.declarative import declarative_base BASE = declarative_base() # 实例化 engine = create_engine( "mysql+pymysql://root:root@127.0.0.1:3306/pytest?charset=utf8", max_overflow=300, # 超出连接池大小最多可以创建的连接 pool_size=100, # 连接池大小 echo=False, # 不显示调试信息 ) class House(BASE): __tablename__ = 'house' id = Column(Integer, primary_key=True, autoincrement=True) title=Column(String(200)) price=Column(String(200)) block=Column(String(200)) building=Column(String(200)) address=Column(String(200)) detail=Column(Text()) name=Column(String(20)) phone=Column(String(20)) BASE.metadata.create_all(engine) Session = sessionmaker(engine) sess = scoped_session(Session)
# 用session取代requests # 解析库使用bs4 # 并发库使用concurrent import requests from bs4 import BeautifulSoup from concurrent.futures import ThreadPoolExecutor from urllib import parse from mysqldb import sess, House import re import time import asyncio headers = { 'referer': 'https://zz.zu.fang.com/', 'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36', 'cookie': 'global_cookie=ffzvt3kztwck05jm6twso2wjw18kl67hqft; integratecover=1; city=zz; __utmc=147393320; ASP.NET_SessionId=vhrhxr1tdatcc1xyoxwybuwv; __utma=147393320.427795962.1613371106.1613575774.1613580597.6; __utmz=147393320.1613580597.6.5.utmcsr=zz.fang.com|utmccn=(referral)|utmcmd=referral|utmcct=/; __utmt_t0=1; __utmt_t1=1; __utmt_t2=1; Rent_StatLog=c158b2a7-4622-45a9-9e69-dcf6f42cf577; keyWord_recenthousezz=%5b%7b%22name%22%3a%22%e4%ba%8c%e4%b8%83%22%2c%22detailName%22%3a%22%22%2c%22url%22%3a%22%2fhouse-a014864%2f%22%2c%22sort%22%3a1%7d%2c%7b%22name%22%3a%22%e9%83%91%e4%b8%9c%e6%96%b0%e5%8c%ba%22%2c%22detailName%22%3a%22%22%2c%22url%22%3a%22%2fhouse-a0842%2f%22%2c%22sort%22%3a1%7d%2c%7b%22name%22%3a%22%e7%bb%8f%e5%bc%80%22%2c%22detailName%22%3a%22%22%2c%22url%22%3a%22%2fhouse-a014871%2f%22%2c%22sort%22%3a1%7d%5d; g_sourcepage=zf_fy%5Elb_pc; Captcha=6B65716A41454739794D666864397178613772676C75447A4E746C657144775A347A6D42554F446532357649643062344F6976756E563450554E59594B7833712B413579506C4B684958343D; unique_cookie=U_0l0d1ilf1t0ci2rozai9qi24k1pkl9lcmrs*14; __utmb=147393320.21.10.1613580597' } data={ 'agentbid':'' } session = requests.session() session.headers = headers # 获取页面 def getHtml(url): res = session.get(url) if res.status_code==200: res.encoding = res.apparent_encoding return res.text else: print(res.status_code) # 获取页面总数量 def getNum(text): soup = BeautifulSoup(text, 'lxml') txt = soup.select('.fanye .txt')[0].text # 取出“共**页”中间的数字 num = re.search(r'\d+', txt).group(0) return num # 获取详细链接 def getLink(url): text=getHtml(url) soup=BeautifulSoup(text,'lxml') links=soup.select('.title a') for link in links: href=parse.urljoin('https://zz.zu.fang.com/',link['href']) hrefs.append(href) # 解析页面 def parsePage(url): res=session.get(url) if res.status_code==200: res.encoding=res.apparent_encoding soup=BeautifulSoup(res.text,'lxml') try: title=soup.select('div .title')[0].text.strip().replace(' ','') price=soup.select('div .trl-item')[0].text.strip() block=soup.select('.rcont #agantzfxq_C02_08')[0].text.strip() building=soup.select('.rcont #agantzfxq_C02_07')[0].text.strip() try: address=soup.select('.trl-item2 .rcont')[2].text.strip() except: address=soup.select('.trl-item2 .rcont')[1].text.strip() detail1=soup.select('.clearfix')[4].text.strip().replace('\n\n\n',',').replace('\n','') detail2=soup.select('.clearfix')[5].text.strip().replace('\n\n\n',',').replace('\n','') detail=detail1+detail2 name=soup.select('.zf_jjname')[0].text.strip() buserid=re.search('buserid: \'(\d+)\'',res.text).group(1) phone=getPhone(buserid) print(title,price,block,building,address,detail,name,phone) house = (title, price, block, building, address, detail, name, phone) info.append(house) try: house_data=House( title=title, price=price, block=block, building=building, address=address, detail=detail, name=name, phone=phone ) sess.add(house_data) sess.commit() except Exception as e: print(e) # 打印错误信息 sess.rollback() # 回滚 except: pass else: print(re.status_code,re.text) # 获取代理人号码 def getPhone(buserid): url='https://zz.zu.fang.com/RentDetails/Ajax/GetAgentVirtualMobile.aspx' data['agentbid']=buserid res=session.post(url,data=data) if res.status_code==200: return res.text else: print(res.status_code) return # 获取详细链接的线程池 async def Pool1(num): loop=asyncio.get_event_loop() task=[] with ThreadPoolExecutor(max_workers=5) as t: for i in range(0,num): url = f'https://zz.zu.fang.com/house/i3{i+1}/' task.append(loop.run_in_executor(t,getLink,url)) # 解析页面的线程池 async def Pool2(hrefs): loop=asyncio.get_event_loop() task=[] with ThreadPoolExecutor(max_workers=30) as t: for href in hrefs: task.append(loop.run_in_executor(t,parsePage,href)) if __name__ == '__main__': start_time=time.time() hrefs=[] info=[] task=[] init_url = 'https://zz.zu.fang.com/house/' num=getNum(getHtml(init_url)) loop = asyncio.get_event_loop() loop.run_until_complete(Pool1(num)) print("共获取%d个链接"%len(hrefs)) print(hrefs) loop.run_until_complete(Pool2(hrefs)) loop.close() print("共获取%d条数据"%len(info)) print("耗时{}".format(time.time()-start_time)) session.close()
Ce qui précède est le contenu détaillé de. pour plus d'informations, suivez d'autres articles connexes sur le site Web de PHP en chinois!