的findall錯誤 - NoneType」對象有沒有屬性‘的findall’

Question

我不斷收到錯誤‘失蹤1個人需要位置參數：‘section_url’’

我每次嘗試的findall工作，我得到這個錯誤。

新學習python，所以任何幫助將不勝感激！

from bs4 import BeautifulSoup 
import urllib3 


def extract_data(): 

    BASE_URL = "http://www.chicagotribune.com/dining/ct-chicago-rooftops-patios-eat-drink-outdoors-near-me-story.html" 

    http = urllib3.PoolManager() 
    r = http.request('GET', 'http://www.chicagotribune.com/dining/ct-chicago-rooftops-patios-eat-drink-outdoors-near-me-story.html') 
    soup = BeautifulSoup(r.data, 'html.parser') 
    heading = soup.find("div", "strong") 
    category_links = [BASE_URL + p.a['href'] for p in heading.findAll('p')] 
    return category_links 
    print(soup) 


extract_data() 

Answer 1

通常，NoneType object has no attribute類錯誤是指上游函數返回None，那麼你沒有檢查它，並試圖訪問其方法：

stuff = get_stuff() # this returns None 
stuff.do_stuff() # this crashes 

最有可能的，圖書館找不到標題爲soup.find。嘗試使用soup.select('div.strong')代替。

更多選擇： https://www.crummy.com/software/BeautifulSoup/bs4/doc/#css-selectors

更多NoneType： https://docs.python.org/3.6/library/constants.html#None

Answer 2

大廈接受的答案的答案，我想這是你想要

from bs4 import BeautifulSoup 
import urllib3 

def extract_data(): 

    BASE_URL = "http://www.chicagotribune.com/dining/ct-chicago-rooftops-patios-eat-drink-outdoors-near-me-story.html" 

    http = urllib3.PoolManager() 
    r = http.request('GET', 'http://www.chicagotribune.com/dining/ct-chicago-rooftops-patios-eat-drink-outdoors-near-me-story.html') 
    soup = BeautifulSoup(r.data, 'html.parser') 
    heading = soup.select('div strong') 
    print(heading) 
    category_links = [BASE_URL + p.a['href'] for p in [i for i, x in enumerate(heading) if x == "p"]] 
    return category_links 


print(extract_data())