python - BeautifulSoup中的parent使用的一点疑问-PHP中文网问答

在看《Python网络数据采集》一书，里面有这样一段代码：

from urllib.request import urlopen
from bs4 import BeautifulSoup

html=urlopen("http://www.pythonscraping.com/pages/page3.html")
bsObj=BeautifulSoup(html,"html.parser")
print(bsObj.find("img",{"src:":"../img/gifts/img1.jpg"}).parent.previous_siblingget_text())

但是运行后出错，提示：

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

爬取得URL对应的网页页面如图所示：

对应的代码如下：








Totally Normal Gifts
Here is a collection of totally normal, totally reasonable gifts that your friends are sure to love! Our collection is
hand-curated by well-paid, free-range Tibetan monks.

We haven't figured out how to make online shopping carts yet, but you can send us a check to:

123 Main St.

Abuja, Nigeria

We will then send your totally amazing gift, pronto! Please include an extra $5.00 for gift wrapping.


Item Title

Description

Cost

Image



Vegetable Basket

This vegetable basket is the perfect gift for your health conscious (or overweight) friends!
Now with super-colorful bell peppers!

$15.00





Russian Nesting Dolls

Hand-painted by trained monkeys, these exquisite dolls are priceless! And by "priceless," we mean "extremely expensive"! 8 entire dolls per set! Octuple the presents!

$10,000.52





Fish Painting

If something seems fishy about this painting, it's because it's a fish! Also hand-painted by trained monkeys!

$10,005.00





Dead Parrot

This is an ex-parrot! Or maybe he's only resting?

$0.50





Mystery Box

If you love suprises, this mystery box is for you! Do not place on light-colored surfaces. May cause oil staining. Keep your friends guessing!

$1.50






© Totally Normal Gifts, Inc. 

+234 (617) 863-0736

Item Title	Description	Cost
Vegetable Basket	This vegetable basket is the perfect gift for your health conscious (or overweight) friends! Now with super-colorful bell peppers!	$15.00
Russian Nesting Dolls	Hand-painted by trained monkeys, these exquisite dolls are priceless! And by "priceless," we mean "extremely expensive"! 8 entire dolls per set! Octuple the presents!	$10,000.52
Fish Painting	If something seems fishy about this painting, it's because it's a fish! Also hand-painted by trained monkeys!	$10,005.00
Dead Parrot	This is an ex-parrot! Or maybe he's only resting?	$0.50
Mystery Box	If you love suprises, this mystery box is for you! Do not place on light-colored surfaces. May cause oil staining. Keep your friends guessing!	$1.50

个人感觉书中代码逻辑上没有错误。。。但是为什么最后IDE会提示'NoneType' object呢。。。是find函数使用不对么。。。应该怎么正确写这段代码呢?

from urllib.request import urlopen from bs4 import BeautifulSoup html=urlopen("http://www.pythonscraping.com/pages/page3.html") bsObj=BeautifulSoup(html,"html.parser") print(bsObj.find("img",{"src":"../img/gifts/img1.jpg"}).parent.previous_sibling.get_text())

全部回复(3)

天蓬老师2017-04-18 09:21:07 3楼

你的代碼... 也太多錯...

"src:" 應改為 "src"
parent.previous_siblingget_text() 應改為 parent.previous_sibling.get_text()

我回答過的問題: Python-QA

赞 +0

添加回复

天蓬老师2017-04-18 09:21:07 2楼

{"src:":"../img/gifts/img1.jpg"}应该改为{"src":"../img/gifts/img1.jpg"}，它找的src属性，没有：这个符号的。还有后面应该是.previous_sibling.get_text()吧！认真点...

高洛峰2017-04-18 09:21:07 1楼

previous_siblingget_text中间少.不说
对find,keyword式
bsObj.find("img",src="../img/gifts/img1.jpg").parent.previous_sibling.get_text()
attr式
bsObj.find("img",attrs={"src":"../img/gifts/img1.jpg"}).parent.previous_sibling.get_text()

参考: http://beautifulsoup.readthedocs.io/zh_CN/latest/#find