python从入门到放弃

学习Python网络数据采集时，讲到标签的查找

from bs4 import BeautifulSoup
from urllib.request import urlopen
import re
html = urlopen('http://www.pythonscraping.com/pages/page3.html')
bsObj = BeautifulSoup(html,"html.parser")
children =  bsObj.findAll('table',{'id':'giftList'}).tr.next_siblings
for child in children:
    print(child)

因为一直在想findAll（）和find（）的区别，于是就改了一下代码，发现报错。

Traceback (most recent call last):
  File "G:/python/reptile/test.py", line 6, in <module>
    children =  bsObj.findAll('table',{'id':'giftList'}).tr.next_siblings
  File "G:\Users\DELL\python\lib\site-packages\bs4\element.py", line 1807, in __getattr__
    "ResultSet object has no attribute '%s'. You're probably treating a list of items like a single item. Did you call find_all() when you meant to call find()?" % key

AttributeError: ResultSet object has no attribute 'tr'. You're probably treating a list of items like a single item. Did you call find_all() when you meant to call find()?

然后查了一下百度发现有人和我一样的。然后了解到：

对象的方法find_all()返回的是一个结果集列表，而结果集列表是一组数据，其是没有属性的，只有单个数据对象才有属性可言。

应该使用find().children,而soup.find()返回的结果一个字符串对象，其可以存在属性的调用。

原网址：https://www.cnblogs.com/my1e3/p/6680476.html