我在XML文件中具有以下结构：
<current>
<city id="2510170" name="Triana">
<coord lon="-6.02" lat="37.38"/>
<country>ES</country>
<sun rise="2016-04-04T06:04:05" set="2016-04-04T18:50:07"/>
</city>
<temperature value="290.92" min="288.15" max="296.15" unit="kelvin"/>
<humidity value="93" unit="%"/>
<pressure value="1009" unit="hPa"/>
<wind>
<speed value="8.2" name="Fresh Breeze"/>
<gusts/>
<direction value="230" code="SW" name="Southwest"/>
</wind>
<clouds value="90" name="overcast clouds"/>
<visibility/>
<precipitation mode="no"/>
<weather number="501" value="moderate rain" icon="10d"/>
<lastupdate value="2016-04-04T10:05:00"/>
</current>
问题是如何使用Python的XPATH提取温度（@value）？即，从以下行的“ 290.2”中提取：
<temperature value="290.92" min="288.15" max="296.15" unit="kelvin"/>
假设根引用<current>节点
from lxml import etree
xml_file = 'test.xml'
with open(xml_file) as xml:
root = etree.XML(xml.read())
temperature_value = root.xpath('./temperature/@value')[0]
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我来说两句