我正在使用網路抓取，首先收集總頁數。我已經測驗了我為另一個網站制作的代碼，但是我在獲取下一頁鏈接 (href) 時遇到了問題。
這是代碼：
from urllib.parse import urljoin
from bs4 import BeautifulSoup
import requests
userName = 'brendanm1975' # just for testing
headers = {'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36'}
pages = []
with requests.Session() as session:
page_number = 1
url = "https://www.last.fm/user/" userName "/library/artists?page="
while True:
response = session.get(url, headers=headers)
soup = BeautifulSoup(response.content, 'html.parser')
pages.append(url)
next_link = soup.find("li", class_="pagination-next")
if next_link is None:
break
url = urljoin(url, next_link["href"])
page_number = 1
如您所見，該站點的 href 將鏈接顯示為“?page=2”，這不允許我獲取其內容（https://www.last.fm/user/brendanm1975/library/artists?page =2 )。
我已經檢查了變數，并且正在獲取值。
print(url) # output: https://www.last.fm/user/brendanm1975/library/artists?page=
next_link.find('a').get('href') # output: '?page=2'
有誰知道如何解決這個問題？
uj5u.com熱心網友回復：
怎么了？
您嘗試urljoin(url, next_link["href"])但next_link沒有屬性，href因為您選擇的<li>不是<a>.
怎么修？
選項#1 - 只需<a>在您的urljoin():
url = urljoin(url, next_link.a["href"])
選項#2 -<a>直接選擇：
next_link = soup.select_one('li.pagination-next a')
例子
from urllib.parse import urljoin
from bs4 import BeautifulSoup
import requests
userName = 'brendanm1975' # just for testing
headers = {'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36'}
pages = []
with requests.Session() as session:
url = "https://www.last.fm/user/" userName "/library/artists?page=1"
while True:
response = session.get(url, headers=headers)
soup = BeautifulSoup(response.content, 'html.parser')
pages.append(url)
next_link = soup.find("li", class_="pagination-next")
if next_link is None:
break
url = urljoin(url, next_link.a["href"])
輸出
['https://www.last.fm/user/brendanm1975/library/artists?page=1',
'https://www.last.fm/user/brendanm1975/library/artists?page=2',
'https://www.last.fm/user/brendanm1975/library/artists?page=3',
'https://www.last.fm/user/brendanm1975/library/artists?page=4',
'https://www.last.fm/user/brendanm1975/library/artists?page=5',
'https://www.last.fm/user/brendanm1975/library/artists?page=6',
'https://www.last.fm/user/brendanm1975/library/artists?page=7',
'https://www.last.fm/user/brendanm1975/library/artists?page=8',
'https://www.last.fm/user/brendanm1975/library/artists?page=9',
'https://www.last.fm/user/brendanm1975/library/artists?page=10',
'https://www.last.fm/user/brendanm1975/library/artists?page=11',
'https://www.last.fm/user/brendanm1975/library/artists?page=12',
'https://www.last.fm/user/brendanm1975/library/artists?page=13',
'https://www.last.fm/user/brendanm1975/library/artists?page=14',
'https://www.last.fm/user/brendanm1975/library/artists?page=15',
'https://www.last.fm/user/brendanm1975/library/artists?page=16',
'https://www.last.fm/user/brendanm1975/library/artists?page=17',
'https://www.last.fm/user/brendanm1975/library/artists?page=18',...]
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