python - scrapy xpath 问题
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 </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？
