Beautiful Soup 错误：“NoneType”对象没有属性“find_all”

Question

我收到此错误：

---> 14 content = s.find_all('p')
AttributeError: 'NoneType' object has no attribute 'find_all'

运行以下脚本时：

r = requests.get('https://www.marketsandmarkets.com/Market-Reports/rocket-missile-market-203298804.html/')
soup = BeautifulSoup(r.content, 'html.parser')
s = soup.find('div', class_='entry-content') 
content = s.find_all('p')
print(content)   

它适用于某些 URL，但对于其他 URL，它会给出属性错误。 不知道为什么会这样。

Answer 1

当soup.find没有找到任何东西时，它返回None 。 使用if s:或if s in not None:保护您的s.find_all呼叫。

所以你的代码变成：

r = requests.get('https://www.marketsandmarkets.com/Market-Reports/rocket-missile-market-203298804.html/')
soup = BeautifulSoup(r.content, 'html.parser')
s = soup.find('div', class_='entry-content') 
if s is not None:
    content = s.find_all('p')
    print(content) 
else:
    print("Didn't find what I was looking for...")

或者可能：

content = s.find_all('p') if s is not None else []
print(content)

参考： https ://crummy.com/software/BeautifulSoup/bs4/doc/#find