bs4 - AttributeError：當搜索沒有結果時，“NoneType”對象沒有屬性“find_all”

Question

我正在使用 Beautifulsoup 過濾來自網站的數據。 為此，我使用網站的內置搜索框循環傳遞了幾個搜索詞。

如果搜索詞沒有找到任何內容，soup 中的以下循環將中斷。

AttributeError Traceback (most recent call last) 
    ~\AppData\Local\Temp/ipykernel_25352/1005464644.py in <cell line: 10>()
     21 
     22         soup = BeautifulSoup(driver.page_source, "html.parser")
---> 23         results = soup.find('ul', {'class':'result-list'}).find_all('li')
     24 
     25         for i in results:

AttributeError: 'NoneType' object has no attribute 'find_all'

因為沒有找到數據，所以邏輯上沒有數據可以傳輸到湯中。

我怎樣才能捕捉到這個錯誤？

謝謝你的幫助。

這是代碼：

# Imports

from selenium import webdriver
from selenium.webdriver.chrome.service import Service
from selenium.common.exceptions import NoSuchElementException
from selenium.webdriver.support.ui import Select
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys

from webdriver_manager.chrome import ChromeDriverManager
driver = webdriver.Chrome(service=Service(ChromeDriverManager().install()))
driver.get("https://www.google.com")


from bs4 import BeautifulSoup
import requests
import pandas as pd

headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36'}

ausschreibungsliste = []


sb_1 = ['66512200', '85140000',  '75000000', '75130000', '75131000',  '79200000' , '79210000' , '79510000']

for z in sb_1:
    
    time.sleep(1)
    driver.get('https://www.service.bund.de/Content/DE/Ausschreibungen/Suche/Formular.html')
    was_sb1 = driver.find_element("xpath", '//input[@id="f4641464d4642144"]')
    was_sb1.send_keys(z)
    was_sb1.send_keys(Keys.RETURN)

    while True:



        soup = BeautifulSoup(driver.page_source, "html.parser")
        results = soup.find('ul', {'class':'result-list'}).find_all('li')

        for i in results:   

            # Liste erzeugen
            
            # Ausschreibung
            ausschreibung = i.find_all('h3')[0].get_text().strip().replace(u'Ausschreibung', u'').replace(u'\xad', u'')

            # Vergabestelle
            organisation = i.find_all('p')[0].get_text().strip().replace(u'Vergabestelle ', u'')

            # Ausschreibungsdatum
            verdatum = i.find_all('p')[1].get_text().strip().replace(u'Veröffentlicht ', u'')

            # Frist
            frist = i.find_all('p')[2].get_text().replace(u'Angebotsfrist ', u'')

            # Typ
            typ = 'Ausschreibung'

            # Website
            website = 'service.bund.de'

            # Prüfung ab
            pruefdatum_format = 'fehlt'

            # Datei erzeugt
            jetzt = 'fehlt'

            i_info = {
                            'Vergabedatum': verdatum,
                            'Frist':  frist,
                            'Organisation': organisation,
                            'Ausschreibung': ausschreibung,
                            'Typ': typ,
                            'Website': website,
                            'Prüfung ab': pruefdatum_format,
                            'Datei erzeugt': jetzt
                                        
                            
                        }
                        
            ausschreibungsliste.append(i_info)

            
        try:
            time.sleep(2)
            driver.find_element("xpath", '//*[@id="main"]/div/div/section[2]/div[1]/div/form/fieldset/div[2]/div[1]/ul/li[2]/a').click()
        
                
        except NoSuchElementException:
            break

Answer 1

像這樣的行中的東西：

if soup.find('ul', {'class':'result-list'}):
    results = soup.find('ul', {'class':'result-list'}).find_all('li')

        for i in results:   
            etc.
else:
    pass

Answer 2

我現在根據 Scott Hunter 和 AudioBaten 的評論找到了一個解決方案。

這是（縮短的）代碼：

ausschreibungsliste = []

# CPV-Codes die zu suchen sind

cpvcode = ['32441300', '64226000' , '66512200']

  
for z in cpvcode:
    
    time.sleep(1)
    driver.get('the_url')
    suchfeld = driver.find_element("xpath", '//input[@id="f4641464d4642144"]')
    suchfeld.clear()
    suchfeld.send_keys(z)
    suchfeld.send_keys(Keys.RETURN)

    try:

        soup = BeautifulSoup(driver.page_source, "html.parser")
        results = soup.find('ul', {'class':'result-list'}).find_all('li')

        while True:
            
            for i in results:   

                # Liste erzeugen
                
                .... etc. ....

                i_info = {
                                'Vergabedatum': verdatum,
                                'Frist':  frist,
                                'Organisation': organisation,
                                'Ausschreibung': ausschreibung,
                                'CPV-Code': z,
                                'Link': linkausschreibung,
                                'Typ': typ,
                                'Website': website,
                                'Prüfung ab': pruefdatum_format,
                                'Datei erzeugt': jetzt
                                            
                                
                            }
                            
                ausschreibungsliste.append(i_info)

            # Nächster Seitenaufruf bis letzte Seite erreicht
            if not soup.select_one('span', {'class':'disabled'}):
                next=driver.find_element("xpath", '//*[@id="main"]/div/div/section[2]/div[1]/div/form/fieldset/div[2]/div[1]/ul/li[2]/a').click()
            else:
                print('Ausschreibungen gefunden :', len(ausschreibungsliste))
                break
    except:
        continue

謝謝你的幫助。