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from lxml import etree
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html="""
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<body>
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<div>
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<h1>Page Title</h1>
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<p>Some text.</p>
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<h2>Section 1</h2>
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<p>More text.</p>
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<h2>Section 2</h2>
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</div>
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</body>
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"""
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from lxml import etree
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selector = etree.HTML(html)
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#修改xpath表达式
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result = selector.xpath('//h2')
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print(result)
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