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現在我試圖從網頁上刮掉所有的url。它共有5個類別,每個類別都有不同的頁面(每頁有10篇文章)。在python中獲取下一頁網址
例如:
Categories Pages
Banana 5
Apple 14
Cherry 7
Melon 6
Berry 2
代碼:
import requests
from bs4 import BeautifulSoup
import re
from urllib.parse import urljoin
res = requests.get('http://www.abcde.com/SearchParts')
soup = BeautifulSoup(res.text,"lxml")
href = [ a["href"] for a in soup.findAll("a", {"id" : re.compile("parts_img.*")})]
b1 =[]
for url in href:
b1.append("http://www.abcde.com"+url)
print (b1)
從主頁 「http://www.abcde.com/SearchParts」 我可以湊每個類別的第一頁的URL。 b1是首頁的網址列表。
像這樣:
Categories Pages url
Banana 1 http://www.abcde.com/A
Apple 1 http://www.abcde.com/B
Cherry 1 http://www.abcde.com/C
Melon 1 http://www.abcde.com/E
Berry 1 http://www.abcde.com/F
然後我用B1的源代碼來湊下一個頁面的網址。所以b2是第二頁網址的列表。
代碼:
b2=[]
for url in b1:
res2 = requests.get(url).text
soup2 = BeautifulSoup(res2,"lxml")
url_n=soup2.find('',rel = 'next')['href']
b2.append("http://www.abcde.com"+url_n)
print(b2)
像這樣:
Categories Pages url
Banana 1 http://www.abcde.com/A/s=1&page=2
Apple 1 http://www.abcde.com/B/s=9&page=2
Cherry 1 http://www.abcde.com/C/s=11&page=2
Melon 1 http://www.abcde.com/E/s=7&page=2
Berry 1 http://www.abcde.com/F/s=5&page=2
現在,當我嘗試做第三個,這是一個錯誤,因爲貝瑞的第二頁是最後一頁,它有沒有「下「在源代碼中。特別是當每個類別都有不同的頁面/網址時,我該怎麼做?
整個代碼(直到它遇到錯誤):自那以後
import requests
from bs4 import BeautifulSoup
import re
from urllib.parse import urljoin
res = requests.get('http://www.ca2-health.com/frontend/SearchParts')
soup = BeautifulSoup(res.text,"lxml")
href = [ a["href"] for a in soup.findAll("a", {"id" : re.compile("parts_img.*")})]
b1 =[]
for url in href:
b1.append("http://www.ca2-health.com"+url)
print (b1)
print("===================================================")
b2=[]
for url in b1:
res2 = requests.get(url).text
soup2 = BeautifulSoup(res2,"lxml")
url_n=soup2.find('',rel = 'next')['href']
b2.append("http://www.ca2-health.com"+url_n)
print(b2)
print("===================================================")
b3=[]
for url in b2:
res3 = requests.get(url).text
soup3 = BeautifulSoup(res3,"lxml")
url_n=soup3.find('',rel = 'next')['href']
b3.append("http://www.ca2-health.com"+url_n)
print(b3)
並在此之後,我會讓B1,B2,B3和......作爲一個名單,我將擁有所有從該頁面的網址。提前致謝。