爬取58二手資料 py

2022-09-11 05:57:12 字數 2878 閱讀 3406

#


第乙個模組 抓取所有頻道鏈結


from bs4 import


beautifulsoup


import


requests


start_url = '


'url_host = '


'def


get_index_url(url):


wb_data =requests.get(url)


soup = beautifulsoup(wb_data.text, '


lxml')


links = soup.select('


ul.ym-submnu > li > b > a')


for link in


links:


page_url = url_host + link.get('


href')


print


(page_url)


get_index_url(start_url)


#第二個模組 抓取所有商品鏈結和詳情資料


from bs4 import


beautifulsoup


import


requests


import


time


import


pymongo


client = pymongo.mongoclient('


localhost


', 27017)


ceshi = client['


ceshi']


url_list = ceshi['


url_list4']


item_info = ceshi['


item_info4']


#在最左邊是在python 中物件的名稱，後面的是在資料庫中的名稱


#spider 1


defget_links_from(channel, pages):


#td.t 沒有這個就終止


list_view = '


{}/pn{}/


'.format(channel, str(pages))


wb_data =requests.get(list_view)


time.sleep(1)


soup = beautifulsoup(wb_data.text, '


lxml')


if soup.find('


td', 't'


):        


for link in soup.select('


td.t a.t'):


item_link = link.get('


href


').split('?'


)[0]


if item_link != '


':url_list.insert()


print


(item_link)


#return urls


else


:        


#it's the last page !


pass


#spider 2


defget_item_info(url):


wb_data =requests.get(url)


soup = beautifulsoup(wb_data.text, '


lxml')


if url[:25] == '


':data=


item_info.insert(data)


else


:        data=


item_info.insert(data)


#第三個模組 主檔案執行開始抓取


from multiprocessing import


pool


from pages_parsing import


get_item_info,url_list,item_info,get_links_from


from channel_extact import


channel_list


item_url = (item['


url'] for item in


url_list.find())


index_urls0 = (item['


url'] for item in


item_info.find())


x =set(item_url)


y =set(index_urls0)


rest_of_urls = x-y


defget_all_links_from(channel):


for i in range(1,100):


get_links_from(channel,i)


return


rest_of_urls


if__name__ == '


__main__':


pool =pool()


#pool = pool(processes=6)


#pool.map(get_all_links_from,channel_list.split())


pool.map(get_item_info,rest_of_urls)


#count = 0


#for url in rest_of_urls:


#print(url)


#count += 1


#print(count)


#第四個模組 檢視資料流


import


time


from pages_parsing import


url_list


while


true:


print


(url_list.find().count())


time.sleep(5)

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