如何仅提取具有 <p> 和 <strong> 的 HTML 标记？

Question

我正在使用 Beautiful Soup 进行一些网页抓取。我已将输出范围缩小到以下范围：

[<p><a class="puCloselink" href="javascript:window.close();" id="ctl00_CloseThisPage" onclick="javascript:window.close();" title="Close Window" usesubmitbehavior="false">Close Window</a></p>, <p class="txtBoxAlign">
<span style="display:none"><input id="Location" name="Location" type="hidden"     value="48001"/>
</span>
<input id="newLocation" type="text"/>
<input id="GeoCode" name="GeoCode" type="hidden" value=""/>
<label for="newLocation">Address or ZIP Code (Required): </label>
</p>, <p class="PharmacyNameTxtBox txtBoxAlign">
<input id="PharmacyName" name="PharmacyName" type="text" value=""/>
<label for="PharmacyName">Pharmacy Name: </label>
</p>, <p>
<strong>CVS Pharmacy #</strong><br/>
                        1025 St Clair River Dr <br/>
                        Algonac, MI 48001<br/>
                        1-810-794-4941
                        </p>, <p>
                     Retail
                       </p>, <p>
                        Not applicable
                        </p>, <p>
<strong>Kroger Pharmacy</strong><br/>
                        2600 Pointe Tremble <br/>
                        Algonac, MI 48001<br/>
                        1-810-671-4002
                        </p>, <p>
                     Retail
                       </p>, <p>
                        Not applicable
                        </p>, <p>
<strong>Rite Aid Pharmacy 04943</strong><br/>
                        402 Pointe Tremble Road <br/>
                        Algonac, MI 48001<br/>
                        1-810-794-4985
                        </p>, <p>
                     Retail
                       </p>, <p>
                        Not applicable
                        </p>]

如您所见，有一些“p”标签内部带有“strong”，而一些“p”标签内部没有“string”。如何隔离整个“p”标签，但只针对那些包含“strong”的“p”？

谢谢。

Answer 1

使用ElementTree 解析和隔离所需的文本。不要忘记在您的 html 周围放置一个行标签，以赋予它一个根并使其可解析。

import xml.etree.ElementTree as ElementTree

myHTML = '<row> <p><a class="puCloselink" href="javascript:window.close();" id="ctl00_CloseThisPage" onclick="javascript:window.close();" title="Close Window" usesubmitbehavior="false">Close Window</a></p>, <p class="txtBoxAlign"> <span style="display:none"><input id="Location" name="Location" type="hidden"     value="48001"/> </span> <input id="newLocation" type="text"/> <input id="GeoCode" name="GeoCode" type="hidden" value=""/> <label for="newLocation">Address or ZIP Code (Required): </label> </p>, <p class="PharmacyNameTxtBox txtBoxAlign"> <input id="PharmacyName" name="PharmacyName" type="text" value=""/> <label for="PharmacyName">Pharmacy Name: </label> </p>, <p> <strong>CVS Pharmacy #</strong><br/> 1025 St Clair River Dr <br/> Algonac, MI 48001<br/> 1-810-794-4941 </p>, <p> Retail </p>, <p> Not applicable </p>, <p> <strong>Kroger Pharmacy</strong><br/> 2600 Pointe Tremble <br/> Algonac, MI 48001<br/> 1-810-671-4002 </p>, <p> Retail </p>, <p> Not applicable </p>, <p> <strong>Rite Aid Pharmacy 04943</strong><br/> 402 Pointe Tremble Road <br/> Algonac, MI 48001<br/> 1-810-794-4985 </p>, <p> Retail </p>, <p> Not applicable </p> </row>'

root = ElementTree.fromstring(myHTML)

p_elements = root.findall("p")

p_strong_elements = []

for element in p_elements:
   if element.find('strong') is not None:
      p_strong_elements.append(element)

# Borrowed from this post: http://stackoverflow.com/questions/380603/how-do-i-get-the-whole-text-of-an-element-using-elementtree
for p_strong_element in p_strong_elements:
    print "<"+p_strong_element.tag+"> "+"".join( [ p_strong_element.text ] + [ ElementTree.tostring(e) for e in p_strong_element.getchildren() ] )+"</"+p_strong_element.tag+"> "
>>>'<p>  <strong>CVS Pharmacy #</strong><br /> 1025 St Clair River Dr <br /> Algonac, MI 48001<br /> 1-810-794-4941 </p> '
>>>'<p>  <strong>Kroger Pharmacy</strong><br /> 2600 Pointe Tremble <br /> Algonac, MI 48001<br /> 1-810-671-4002 </p> '
>>>'<p>  <strong>Rite Aid Pharmacy 04943</strong><br /> 402 Pointe Tremble Road <br /> Algonac, MI 48001<br /> 1-810-794-4985 </p> 

'

Answer 2

找到了一个非常简单的答案：

for i in table:
    if "strong" in str(i):
        address.append(i)

可能不是最优雅的方式，但它对我有用。