AttributeError：'NoneType‘对象没有属性'attrs’

Question

我对蟒蛇很陌生。请帮我解决这个错误。

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

from bs4 import BeautifulSoup
import urllib2
import requests

url = 'https://www.justdial.com/Pune/Event-Organisers/nct-10194150'

req = urllib2.Request(url, headers={'User-Agent' : "Magic Browser"}) 

page = urllib2.urlopen(req).read()

soup = BeautifulSoup(page,'html.parser')

for h in soup.findAll('h2'):
    a = h.find('a')

    if 'href' in a.attrs:
        l = a.get('href')

    print l

Answer 1

使用“尝试”--除非避免NoneType异常：

from bs4 import BeautifulSoup
import urllib2
import requests

url = 'https://www.justdial.com/Pune/Event-Organisers/nct-10194150'

req = urllib2.Request(url, headers={'User-Agent' : "Magic Browser"}) 

page = urllib2.urlopen(req).read()

soup = BeautifulSoup(page,'html.parser')

for h in soup.findAll('h2'):
    a = h.find('a')
    try:
        if 'href' in a.attrs:
            l = a.get('href')
    except:
        pass

    print l

OR:检查a是否为None：

from bs4 import BeautifulSoup
import urllib2
import requests

url = 'https://www.justdial.com/Pune/Event-Organisers/nct-10194150'

req = urllib2.Request(url, headers={'User-Agent' : "Magic Browser"}) 

page = urllib2.urlopen(req).read()

soup = BeautifulSoup(page,'html.parser')

for h in soup.findAll('h2'):
    a = h.find('a')

    if a is not None and 'href' in a.attrs:
        l = a.get('href')

    print l

Answer 2

您应该不检查a元素。在a中似乎没有h2标签，因此a就是NoneType。

if a and 'href' in a.attrs:
    l = a.get('href')

Answer 3

您所检查的一些元素为None，您应该确保找到的"a“元素实际上具有attrs属性，您可以使用hasattr内置函数：

hasattr(a, "attrs")

如果有吸引，则返回true；如果没有，则返回false。阅读关于这一功能的文章