Scrapy xpath 匹配不到一些数据

<table class="tabledataformat" cellspacing="0" >
	<tr>
		<td style="vertical-align:top;">Copper, Cu&nbsp;</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>
</table>

response.xpath('//table[@class="tabledataformat"]/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>

<= 0.03 % 和消失不见，为什么呢？

4 replies • 2017-03-07 10:56:49 +08:00

imn1

Mar 4, 2017

因为<=的写法不符合 xml 标准

leavic

Mar 4, 2017

这部分数据可能是 javascript 异步请求显示的，也就是 ajax 内容， scrapy 是看不到的。

dsg001

Mar 4, 2017

'''
<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>
'''

测试 lxml 能输出， scrapy 应该也没问题，查看 html 源码吧

crazypig14

Mar 7, 2017

scrapy 爬下来用 beautifulsoup 处理，我觉得方便些