[英]How to scrape additional pages of the main page in a website
我是python的新手。 在一些幫助下,我編寫了一些代碼來從網頁上抓取一些數據。 但是,我只能根據代碼抓取每個鏈接的首頁。
目前,下面的代碼使我可以基於首頁抓取每年數據的鏈接( https://aviation-safety.net/database/dblist.php?Year=1949 )。
但是,在某些年份中,特定年份的鏈接( https://aviation-safety.net/database/dblist.php?Year=1949&lang= &page = 2 )( https://aviation-safety.net/database/dblist.php?Year=1949&lang=&page=3 )
我想知道是否有可能根據每年數據的附加頁面來檢索附加鏈接。
#get the additional links within each Year Link
import pandas as pd
from bs4 import BeautifulSoup
import requests
headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36'}
main_url = "https://aviation-safety.net/database/"
def get_and_parse_url(main_url):
result = requests.get(main_url)
soup = BeautifulSoup(result.content, 'html.parser')
data_table = [main_url + i['href'] for i in soup.select('[href*=Year]')]
return data_table
with requests.Session() as s:
data_table = get_and_parse_url(main_url)
df = pd.DataFrame(data_table, columns=['url'])
datatable2 = [] #create outside so can append to it
for anker in df.url:
result = s.get(anker, headers = headers)
soup = BeautifulSoup(result.content, 'html.parser')
datatable2.append(['https://aviation-safety.net' + i['href'] for i in soup.select('[href*="database/record"]')])
#flatten list of lists
datatable2 = [i for sublist in datatable2 for i in sublist]
df2 = pd.DataFrame(datatable2 , columns=['add_url'])
for i in df2.add_url:
print(i)
非常感謝任何形式的幫助,謝謝!
對於每個初始記錄頁面,您可以通過為子對象收集具有類pagenumbers
元素中a
標記(通過添加nth-of限制為前一個)來確定子頁面的匹配項; 在列表理解中執行此操作,該列表生成實際的其他頁面URL; 然后為這些頁面使用額外的循環收集。 在撰寫本文時,這產生了22,629個不同的鏈接。
import requests
from bs4 import BeautifulSoup as bs
base = 'https://aviation-safety.net/database/'
headers = {'User-Agent':'Mozilla/5.0'}
inner_links = []
def get_soup(url):
r = s.get(url, headers = headers)
soup = bs(r.text, 'lxml')
return soup
with requests.Session() as s:
soup = get_soup('https://aviation-safety.net/database/')
initial_links = [base + i['href'] for i in soup.select('[href*="Year="]')]
for link in initial_links:
soup = get_soup(link)
inner_links+= ['https://aviation-safety.net' + i['href'] for i in soup.select('[href*="database/record"]')]
pages = [f'{link}&lang=&page={i.text}' for i in soup.select('.pagenumbers:nth-of-type(2) a')]
for page in pages:
soup = get_soup(page)
inner_links+= ['https://aviation-safety.net' + i['href'] for i in soup.select('[href*="database/record"]')]
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