我正在使用Scrapy在页面上抓取表格：

import scrapy
from ..items import TestItem
from scrapy.loader import ItemLoader

class TestSpider(scrapy.Spider):
    name = 'test'

    def parse(self, response):
        items = response.xpath('//*[@id="12"]/div/div/div[2]/table/tbody/tr')
        for l in items:
            il = ItemLoader(item=TestItem(), selector=l)
            # From should be text before <span></span> and To should be after
            il.add_xpath('from', 'td[2]')
            il.add_xpath('to', 'td[2]')
            yield il.load_item()
        pass

示例数据：

<tr>
<td class="test">date</td>
<td class="test2">London<span></span>Prague</td>
</tr>

我需要将“伦敦”文本提交到“from”，将“布拉格”文本提交到“to”。换句话说，我如何拆分值？