使用beautifulsoup.find奇怪的语法错误（） [英] Weird syntax error in using beautifulsoup.find()

问题描述

这可能完全是显而易见的，但我很为难（还挺新的Python，不好意思）：

This may be entirely obvious, but I'm stumped (kinda new to python, sorry):

page = urllib2.urlopen("http://www.somerandompage.com")
soup = BeautifulSoup(page)
currentDate = soup.find("span", class="posted-on")

我要找的页面下面的元素：

I'm looking for the following element in the page:

<span class="posted-on">Posted on Friday, <br/>August 12th, 2011</span>

我得到这个语法错误，而不是：

I'm getting this syntax error instead:

"test.py", line 22
currentDate = soup.find("span", class="posted-on")
                                    ^
SyntaxError: invalid syntax

基本的在线文档似乎等同于我（假设显然find_parents（）和find（）工作大致相同的方式）：

The basic documentation online seems identical to me (obviously assuming find_parents() and find() work much the same way):

a_string.find_parent("p")
# <p class="story">Once upon a time there were three little sisters; and their names were
#  <a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>,
#  <a class="sister" href="http://example.com/lacie" id="link2">Lacie</a> and
#  <a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>;
#  and they lived at the bottom of a well.</p>

a_string.find_parents("p", class="title")
# []

那么，我做错了什么？我知道类是保留的Python关键词;那是什么不知何故搞乱这个吗？

So what am I doing wrong? I know class is a reserved Python keyword; is that what's messing this up somehow?

推荐答案

您不能使用类作为关键字参数。使用 {'类'：'贴式'} 而不是：

You cannot use class as a keyword argument. Use {'class': 'posted-on'} instead:

currentDate = soup.find('span', {'class': 'posted-on'})

另外，BS4支持 类_ 拼写太：

currentDate = soup.find('span', class_='posted-on')

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