scrapy python xpath相关问题，scrapyxpath,Response.bod

scrapy python xpath相关问题，scrapyxpath,Response.bod

Response.body中有

<tr>    <td style="vertical-align:top;">Copper, Cu</td>    <td class="dataCell" style="vertical-align:top;"><= 0.03 %<span class="dataCondition"></span></td>    <td class="dataCell" style="vertical-align:top;"><= 0.03 %<span class="dataCondition"></span></td>    <td class="dataComment" style="vertical-align:top;"></td></tr>

之后运行
**response.xpath('/tr').extract()
只能获取到**

<tr>    <td style="vertical-align:top;">Copper, Cu&nbsp;</td>    <td class="dataCell" style="vertical-align:top;"></td>    <td class="dataCell" style="vertical-align:top;"></td>    <td class="dataComment" style="vertical-align:top;"></td></tr>

的出来的结果
<= 0.03 % 和 <span></span>消失不见，为什么呢？

编橙之家文章，