AttributeError：＆＃39; NoneType＆＃39;对象没有属性＆＃39; attrs＆＃39;

Question

我是python的新手。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

您应该检查a元素。似乎a中没有h2个标签，因此a为NoneType

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

Answer 2

使用try-except来避免NoneType例外：

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

或 检查a是否为无：

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 3

你检查的一些元素是无，你应该确保＆＃34; a＆＃34;你找到的元素实际上有attrs属性，你可以使用hasattr内置函数：

hasattr(a, "attrs")

如果a有attrs，

将返回true，否则返回false。 阅读this function