Question

我正在抓取一个页面而无法获取某个字段，因为它存储在一个javascript变量中。

我的问题是，如何抓取以下代码，解码并保存<li>代码内容？使用BeautifulSoup和其他任何python。

以下是<script>代码中的代码：

<script type="text/javascript">
    var html_audition_details_sidebar = '    \u003Cdiv id\u003D\u0022apply_wrapper\u0022\u003E        \u003Cdiv class\u003D\u0022header\u0022\u003E            \u003Cp\u003EAudition Information\u003C/p\u003E        \u003C/div\u003E        \u003Cdiv class\u003D\u0022text  \u0022\u003E            \u003Cdiv class\u003D\u0022roleContainer \u0022 style\u003D\u0022color: #999\u003B font\u002Dsize: 14px\u003B\u0022\u003E                \u003Cp\u003EOnly official members can see audition information for this job\u003C/p\u003E            \u003C/div\u003E        \u003C/div\u003E        \u003Cdiv class\u003D\u0022applyButton\u0022\u003E            \u003Cp\u003E\u003Ca class\u003D\u0022applyLink\u0022                                        href\u003D\u0022/accounts/login/apply/41680/\u0022\u003ESubscribe Now                  \u003C/a\u003E\u003C/p\u003E        \u003C/div\u003E    \u003C/div\u003E';
    var html_additional_requirements = '';
    var html_role_listing = '\u003Cdiv class\u003D\u0022text callListing loggedout \u0022\u003E    \u003Cp class\u003D\u0022title\u0022\u003E\u003Ca name\u003D\u0022roles\u0022\u003E\u003C/a\u003ESeeking Talent \u003Cspan class\u003D\u0022optional\u0022\u003ESelect a role below for more information and submission instructions.\u003C/span\u003E\u003C/p\u003E    \u003Cdiv class\u003D\u0022castingRoles\u0022\u003E        \u003Cul\u003E                                \u003Cli \u003E                \u003Ca href\u003D\u0022/casting/untitled\u002Dcomedy\u002Dshort\u002D41680/martinique\u002D159296/\u0022\u003E                    Martinique  (Lead):                \u003Cspan class\u003D\u0022roletag\u0022\u003E                    Female, 18\u002D25, Caucasian                \u003C/span\u003E                \u003Cspan class\u003D\u0022applyNow\u0022\u003E \u003C/span\u003E                \u003C/a\u003E                \u003Cp class\u003D\u0022role\u002Ddesc\u0022                   style\u003D\u0022border\u002Dbottom: none\u003B padding\u002Dbottom: 0px\u003B margin\u002Dbottom: 0px\u003B\u0022\u003E                    native French speaker.                \u003C/p\u003E            \u003C/li\u003E                                            \u003Cli \u003E                \u003Ca href\u003D\u0022/casting/untitled\u002Dcomedy\u002Dshort\u002D41680/justin\u002D159297/\u0022\u003E                    Justin  (Lead):                \u003Cspan class\u003D\u0022roletag\u0022\u003E                    Male, 20\u002D25, All Ethnicities                \u003C/span\u003E                \u003Cspan class\u003D\u0022applyNow\u0022\u003E \u003C/span\u003E                \u003C/a\u003E                \u003Cp class\u003D\u0022role\u002Ddesc\u0022                   style\u003D\u0022border\u002Dbottom: none\u003B padding\u002Dbottom: 0px\u003B margin\u002Dbottom: 0px\u003B\u0022\u003E                    comedy and improv skills, hopeless romantic.                \u003C/p\u003E            \u003C/li\u003E                                            \u003Cli \u003E                \u003Ca href\u003D\u0022/casting/untitled\u002Dcomedy\u002Dshort\u002D41680/flower\u002Dshop\u002Dsalesperson\u002D159299/\u0022\u003E                    Flower Shop Salesperson :                \u003Cspan class\u003D\u0022roletag\u0022\u003E                    Males \u0026amp\u003B Females, 30+, All Ethnicities                \u003C/span\u003E                \u003Cspan class\u003D\u0022applyNow\u0022\u003E \u003C/span\u003E                \u003C/a\u003E                \u003Cp class\u003D\u0022role\u002Ddesc\u0022                   style\u003D\u0022border\u002Dbottom: none\u003B padding\u002Dbottom: 0px\u003B margin\u002Dbottom: 0px\u003B\u0022\u003E                    impatient.                \u003C/p\u003E            \u003C/li\u003E                                            \u003Cli \u003E                \u003Ca href\u003D\u0022/casting/untitled\u002Dcomedy\u002Dshort\u002D41680/models\u002D159300/\u0022\u003E                    Models  (Supporting):                \u003Cspan class\u003D\u0022roletag\u0022\u003E                    Female, 18\u002D35, All Ethnicities                \u003C/span\u003E                \u003Cspan class\u003D\u0022applyNow\u0022\u003E \u003C/span\u003E                \u003C/a\u003E                \u003Cp class\u003D\u0022role\u002Ddesc\u0022                   style\u003D\u0022border\u002Dbottom: none\u003B padding\u002Dbottom: 0px\u003B margin\u002Dbottom: 0px\u003B\u0022\u003E                    small roles, under five lines.                \u003C/p\u003E            \u003C/li\u003E                            \u003C/ul\u003E    \u003C/div\u003E\u003C/div\u003E';
</script>

格式可怕，我道歉。

我需要仅为变量li保存所有html_role_listing标记内的网址。

示例：

转过来：

\u003Ca href\u003D\u0022/casting/untitled\u002Dcomedy\u002Dshort\u002D41680/martinique\u002D159296/\u0022\u003E

进入这个：

/casting/untitled-comedy-short-41680/martinique-159296/

提前感谢您的帮助！

Answer 1

如果您想以通用方式执行此操作，则需要一个解析javascript的库。在此示例中，我将使用slimit来执行此操作。

首先，加载您的数据：

from bs4 import BeautifulSoup as Soup
import slimit
from slimit.parser import Parser
from slimit.visitors import nodevisitor    

a = """<script type="text/javascript">
    var html_audition_details_sidebar = '    \u003Cdiv id\u003D\u0022apply_wrapper\u0022\u003E        \u003Cdiv class\u003D\u0022header\u0022\u003E            \u003Cp\u003EAudition Information\u003C/p\u003E        \u003C/div\u003E        \u003Cdiv class\u003D\u0022text  \u0022\u003E            \u003Cdiv class\u003D\u0022roleContainer \u0022 style\u003D\u0022color: #999\u003B font\u002Dsize: 14px\u003B\u0022\u003E                \u003Cp\u003EOnly official members can see audition information for this job\u003C/p\u003E            \u003C/div\u003E        \u003C/div\u003E        \u003Cdiv class\u003D\u0022applyButton\u0022\u003E            \u003Cp\u003E\u003Ca class\u003D\u0022applyLink\u0022                                        href\u003D\u0022/accounts/login/apply/41680/\u0022\u003ESubscribe Now                  \u003C/a\u003E\u003C/p\u003E        \u003C/div\u003E    \u003C/div\u003E';
    var html_additional_requirements = '';
    var html_role_listing = '\u003Cdiv class\u003D\u0022text callListing loggedout \u0022\u003E    \u003Cp class\u003D\u0022title\u0022\u003E\u003Ca name\u003D\u0022roles\u0022\u003E\u003C/a\u003ESeeking Talent \u003Cspan class\u003D\u0022optional\u0022\u003ESelect a role below for more information and submission instructions.\u003C/span\u003E\u003C/p\u003E    \u003Cdiv class\u003D\u0022castingRoles\u0022\u003E        \u003Cul\u003E                                \u003Cli \u003E                \u003Ca href\u003D\u0022/casting/untitled\u002Dcomedy\u002Dshort\u002D41680/martinique\u002D159296/\u0022\u003E                    Martinique  (Lead):                \u003Cspan class\u003D\u0022roletag\u0022\u003E                    Female, 18\u002D25, Caucasian                \u003C/span\u003E                \u003Cspan class\u003D\u0022applyNow\u0022\u003E \u003C/span\u003E                \u003C/a\u003E                \u003Cp class\u003D\u0022role\u002Ddesc\u0022                   style\u003D\u0022border\u002Dbottom: none\u003B padding\u002Dbottom: 0px\u003B margin\u002Dbottom: 0px\u003B\u0022\u003E                    native French speaker.                \u003C/p\u003E            \u003C/li\u003E                                            \u003Cli \u003E                \u003Ca href\u003D\u0022/casting/untitled\u002Dcomedy\u002Dshort\u002D41680/justin\u002D159297/\u0022\u003E                    Justin  (Lead):                \u003Cspan class\u003D\u0022roletag\u0022\u003E                    Male, 20\u002D25, All Ethnicities                \u003C/span\u003E                \u003Cspan class\u003D\u0022applyNow\u0022\u003E \u003C/span\u003E                \u003C/a\u003E                \u003Cp class\u003D\u0022role\u002Ddesc\u0022                   style\u003D\u0022border\u002Dbottom: none\u003B padding\u002Dbottom: 0px\u003B margin\u002Dbottom: 0px\u003B\u0022\u003E                    comedy and improv skills, hopeless romantic.                \u003C/p\u003E            \u003C/li\u003E                                            \u003Cli \u003E                \u003Ca href\u003D\u0022/casting/untitled\u002Dcomedy\u002Dshort\u002D41680/flower\u002Dshop\u002Dsalesperson\u002D159299/\u0022\u003E                    Flower Shop Salesperson :                \u003Cspan class\u003D\u0022roletag\u0022\u003E                    Males \u0026amp\u003B Females, 30+, All Ethnicities                \u003C/span\u003E                \u003Cspan class\u003D\u0022applyNow\u0022\u003E \u003C/span\u003E                \u003C/a\u003E                \u003Cp class\u003D\u0022role\u002Ddesc\u0022                   style\u003D\u0022border\u002Dbottom: none\u003B padding\u002Dbottom: 0px\u003B margin\u002Dbottom: 0px\u003B\u0022\u003E                    impatient.                \u003C/p\u003E            \u003C/li\u003E                                            \u003Cli \u003E                \u003Ca href\u003D\u0022/casting/untitled\u002Dcomedy\u002Dshort\u002D41680/models\u002D159300/\u0022\u003E                    Models  (Supporting):                \u003Cspan class\u003D\u0022roletag\u0022\u003E                    Female, 18\u002D35, All Ethnicities                \u003C/span\u003E                \u003Cspan class\u003D\u0022applyNow\u0022\u003E \u003C/span\u003E                \u003C/a\u003E                \u003Cp class\u003D\u0022role\u002Ddesc\u0022                   style\u003D\u0022border\u002Dbottom: none\u003B padding\u002Dbottom: 0px\u003B margin\u002Dbottom: 0px\u003B\u0022\u003E                    small roles, under five lines.                \u003C/p\u003E            \u003C/li\u003E                            \u003C/ul\u003E    \u003C/div\u003E\u003C/div\u003E';
</script>"""
soup = Soup(a)
js_content = soup.findAll('script')[0].text

现在您可以选择：使用正则表达式解析js_content或使用词法分析器（在这种情况下为slimit）。

par = Parser()
tree = par.parse(js_content)
encoded_html = [n.value for n in nodevisitor.visit(tree) if isinstance(n, slimit.ast.String)][2]

最后，您可以轻松解码该字符串，这是有效的HTML：

decoded_html = encoded_html.decode('unicode_escape')
print(decoded_html)

重新解析这个HTML：

role_listing = Soup(decoded_html)
output = [ anchor.attrs['href'] for anchor in role_listing.select('li a') ]
print('---')
print("\n".join(output))

输出如下：

'<div class="text callListing loggedout ">    <p class="title"><a name="roles"></a>Seeking Talent <span class="optional">Select a role below for more information and submission instructions.</span></p>    <div class="castingRoles">        <ul>                                <li >                <a href="/casting/untitled-comedy-short-41680/martinique-159296/">                    Martinique  (Lead):                <span class="roletag">                    Female, 18-25, Caucasian                </span>                <span class="applyNow"> </span>                </a>                <p class="role-desc"                   style="border-bottom: none; padding-bottom: 0px; margin-bottom: 0px;">                    native French speaker.                </p>            </li>                                            <li >                <a href="/casting/untitled-comedy-short-41680/justin-159297/">                    Justin  (Lead):                <span class="roletag">                    Male, 20-25, All Ethnicities                </span>                <span class="applyNow"> </span>                </a>                <p class="role-desc"                   style="border-bottom: none; padding-bottom: 0px; margin-bottom: 0px;">                    comedy and improv skills, hopeless romantic.                </p>            </li>                                            <li >                <a href="/casting/untitled-comedy-short-41680/flower-shop-salesperson-159299/">                    Flower Shop Salesperson :                <span class="roletag">                    Males &amp; Females, 30+, All Ethnicities                </span>                <span class="applyNow"> </span>                </a>                <p class="role-desc"                   style="border-bottom: none; padding-bottom: 0px; margin-bottom: 0px;">                    impatient.                </p>            </li>                                            <li >                <a href="/casting/untitled-comedy-short-41680/models-159300/">                    Models  (Supporting):                <span class="roletag">                    Female, 18-35, All Ethnicities                </span>                <span class="applyNow"> </span>                </a>                <p class="role-desc"                   style="border-bottom: none; padding-bottom: 0px; margin-bottom: 0px;">                    small roles, under five lines.                </p>            </li>                            </ul>    </div></div>'
---
/casting/untitled-comedy-short-41680/martinique-159296/
/casting/untitled-comedy-short-41680/justin-159297/
/casting/untitled-comedy-short-41680/flower-shop-salesperson-159299/
/casting/untitled-comedy-short-41680/models-159300/

Answer 2

不需要JS解析器！

我假设您知道您的<script>内容将按照示例中的格式进行格式化，并且您已将该标记的内容抓取到名为{{1}的变量中}。

首先，我们需要获得script_text的价值，我们可以用一个好的ol＆＃39;正则表达式：

html_role_listing

然后，我们利用>>> import re >>> html_role_listing_match = re.search(r'var html_role_listing = \'(.+)\';$', script_text, re.MULTILINE) >>> html_role_listing = html_role_listing_match.group(1)和类似转义序列在Python Unicode字符串中也有效的事实（就像它们在JS字符串中有效一样），并使用更安全的版本解析它们\u003C：

eval

为了证明这一点，你可以检查一下这几个字符，看看它们是否已被正确解析：

>>> import ast
>>> roles_html = ast.literal_eval("u'%s'" % html_role_listing)

现在，您有一个可以使用BeautifulSoup解析的HTML字符串：

>>> print roles_html[:10]
<div class

抓住这些链接＆＃39; >>> from bs4 import BeautifulSoup >>> soup = BeautifulSoup(roles_html)属性。

href

BeautifulSoup从javascript（编码）变量中删除

2 个答案: