python3网络爬虫 (2)-使用BeautifulSoup获取网页标题

1. 使用python包管理工具安装BeautifulSoup

pip install  beautifulsoup4

2. 新建2.py文件，将以下代码拷贝到文件中

#!/usr/bin/python
# -*- coding: UTF-8 -*-

from urllib.request import urlopen
from bs4 import BeautifulSoup
html = urlopen("http://www.toutiao.com")
bsObj = BeautifulSoup(html.read(), 'lxml')
print(bsObj.title)

3. 运行python 3.py，可以看到打印出了 “”，这样就成功拿到了页面的标题

   
   
   

4. 添加异常处理

将2.py中的代码替换为以下代码

#!/usr/bin/python
# -*- coding: UTF-8 -*-

from urllib.request import urlopen
from urllib.error import HTTPError
from bs4 import BeautifulSoup

def getTitle(url):
    try:
        html = urlopen(url)
    except HTTPError as e:      # http异常处理
        return "http异常"

    try:
        bsObj = BeautifulSoup(html.read(), 'lxml')
        title = bsObj.title
    except AttributeError as e:  # 标签异常处理
        return "标签异常"
    return title

title = getTitle('http://www.toutiao.com')
if title == None:
    print ("title 没有找到")
else:
    print(title)

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