美丽的汤4 CSS选择器不相同的方式工作教程节目 [英] Beautiful Soup 4 CSS selector does not work the same way the tutorial show
问题描述
我运行的样品CSS选择器的codeS由[美丽的汤4教程页] [1]，但结果是不同的，有的给出正确的结果，有些则没有。在网站上，他们说应该以同样的方式在Python 2.7和3。我的Python 2.7和安装美丽的汤4。有没有人有同样的问题？
I run the sample CSS selector codes from [Beautiful Soup 4 tutorial page][1], but the results are different, some give the correct result, some do not. In the website, they say it should work the same way in Python 2.7 and 3. I have Python 2.7 and install Beautiful Soup 4. Does anyone have the same issue?
from bs4 import BeautifulSoup
import urllib2
html_doc = """
<html><head><title>The Dormouse's story</title></head>
<body>
<p class="title"><b>The Dormouse's story</b></p>
<p class="story">Once upon a time there were three little sisters; and their names were
<a href="http://example.com/elsie" class="sister" id="link1">Elsie</a>,
<a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and
<a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>;
and they lived at the bottom of a well.</p>
<p class="story">...</p>
"""
soup = BeautifulSoup(html_doc)
我的测试（当然我用的是相同的HTML文档中的教程）：
My test (of course I use the same html doc in the tutorial):
soup.select("#link1 ~ .sister")
[]
他们的测试：
soup.select("#link1 ~ .sister")
# [<a class="sister" href="http://example.com/lacie" id="link2">Lacie</a>,
# <a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>]
推荐答案
我已经想通了你的问题。您正在使用一个版本的BeautifulSoup是年纪比4.3.2。
I've figured out your problem. You are using a version of BeautifulSoup that is older than 4.3.2.
我刚安装了4.1.2，和我跑你code。我有同样的问题，我得到了一个空表，现在我已经是更新到4.3.2，我又得到兄弟姐妹的列表。
I just had 4.1.2 installed, and I ran your code. I had the same problem, I got an empty list, now that I've updated it to 4.3.2, I get the list of siblings again.
您的可以的通过PIP安装它，但你也可以得到最新的一封来自PyPI 版本并下载。
You can install it via pip, but you can also get the latest version from Pypi and download it.
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