问如何利用BeatuifulSoup在多个页面中进行网页浏览
EN

Stack Overflow用户

提问于 2019-08-13 12:11:59

回答 2查看 274关注 0票数 1

我试图在网上刮多个页面，并且我已经成功地检索到了一个页面的数据。现在，我想知道如何实现一些循环来从几个页面中检索数据。

到网页的链接是：category/dealers-distributors/

这是我的密码：

from bs4 import BeautifulSoup
import requests
import csv

source = requests.get('https://www.diac.ca/directory/wpbdp_category/dealers-distributors/').text

soup = BeautifulSoup(source, 'lxml')

csv_file = open('scrape.csv', 'w')

csv_writer = csv.writer(csv_file)
csv_writer.writerow(['company', 'website'])

for i in soup.find_all('div', class_='wpbdp-listing'):
    company = i.find('div', class_='listing-title').a.text
    print(company)

    website = i.find('div', class_='wpbdp-field-business_website_address').span.a.text
    print(website)

    csv_writer.writerow([company, website])

csv_file.close()

我非常感谢你的反馈和见解。非常感谢!

python

html

beautifulsoup

回答 2

Stack Overflow用户

回答已采纳

发布于 2019-08-13 12:30:14

一种可能是尝试使用class=next在标记下查找链接。如果存在链接，请使用该链接加载下一页。如果该链接不存在，则中断循环：

import requests
from bs4 import BeautifulSoup

source = requests.get('https://www.diac.ca/directory/wpbdp_category/dealers-distributors/').text

soup = BeautifulSoup(source, 'lxml')

page = 1
while True:
    print('Page no. {}'.format(page))
    print('-' * 80)
    for i in soup.find_all('div', class_='wpbdp-listing'):
        company = i.find('div', class_='listing-title').a.text
        print(company)

        website = i.find('div', class_='wpbdp-field-business_website_address').span.a.text
        print(website)

    if soup.select_one('.next a[href]'):
        soup = BeautifulSoup(requests.get(soup.select_one('.next a[href]')['href']).text, 'lxml')
        page += 1
    else:
        break

指纹：

Page no. 1
--------------------------------------------------------------------------------
AMD Medicom Inc.
http://www.medicom.ca
Clinical Research Dental Supplies & Services Inc.
http://www.clinicalresearchdental.com
Coltene Whaledent
http://www.coltene.com
CompuDent Systems Inc.
http://www.compudent.ca
DenPlus Inc.
http://www.denplus.com
Dental Canada Instrumentation
http://www.mydentalcanada.com
Dental Services Group of Toronto Inc.
http://www.dsgtoronto.com
Dental Wings Inc.
http://www.dentalwings.com
Dentsply Sirona Canada
http://www.dentsplysirona.ca
DiaDent Group International Inc.
http://www.diadent.com
Page no. 2
--------------------------------------------------------------------------------
DMG America LLC
http://www.dmg-america.com
Hager Worldwide, Inc.
http://www.hagerworldwide.com
Hansamed Ltd
http://www.hansamed.net
Henry Schein Canada
http://www.henryschein.com
Heraeus Kulzer LLC
http://www.heraeus-kulzer-us.com
Johnson & Johnson Inc.
http://www.jjnjcanada.com
K-Dental Inc.
http://www.k-dental.ca
Kerr Dental
http://www.kerrdental.com
Northern Surgical & Medical Supplies Ltd.
www.northernsurgical.com
Northern Surgical and Medical Supplies Ltd.
http://www.northernsurgical.com
Page no. 3
--------------------------------------------------------------------------------
Patterson Dental/Dentaire Canada Inc.
http://www.pattersondental.ca
Procter & Gamble Oral Health
http://www.pg.com
Qwerty Dental Inc.
http://www.qwertydental.com
Sable Industries Inc.
http://www.sableindustriesinc.com
Septodont of Canada, Inc.
http://www.septodont.ca
Sure Dental Supplies of Canada Inc.
http://www.suredental.com
Swiss NF Metals Inc.
http://www.swissnf.com
The Aurum Group
http://www.aurumgroup.com
The Surgical Room Inc.
http://www.thesurgicalroom.ca
Unique Dental Supply Inc.
http://www.uniquedentalsupply.com

票数 1

Stack Overflow用户

发布于 2019-08-13 13:04:31

一般过程是这样的：

# Make soup

links = [link.get('href') for link in soup.find_all('a')]  #These are the links you want to visit next


for link in links:
    requests.get(link)
    # Do whatever / make soup again

对此也有帮助的是requests.Session()，它维护cookies / headers等。

session = requests.Session()

session.get(some_url)

下面是我刚才写的一个示例，它更多地涉及到显示抓取的一般流程：

def scrape_data(link):
    entries = soup.find_all('div', class_='data')
    return [entry.text for entry in entries]

def paginate(link):
     requests.get(link)
     links = soup.find_all('a', class_='nav')
     return [link.get('href') for link in links]

def main():
    data = [scrape_data(link) for link in paginate(starting_link)]
    # Export / process data here