content=etree(tr_list[i]).xpath('//td[@class="pl20"]/span')[0].xpath('string(.)')？？？
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<span> <span>test</span> <span>.pdf</span></span>
from lxml import etree
html = etree.parse('hello.html')
result = html.xpath('//span/span/text()')
print(result)運行結(jié)果['test', '.pdf']
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