lxml xslt

from lxml.etree import XSLT,fromstring
 
xml = fromstring("<a key='value'>ez</a>")
 
xsl= fromstring("""<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output method = "html"  version="1.0" encoding="UTF-8" omit-xml-declaration="yes" standalone="yes" indent="no"  />
 
    <xsl:template match="a">
	<xsl:value-of select="@key"/>
    </xsl:template>
 
</xsl:stylesheet>""")
 
style = XSLT(xsl)
result = style.apply( xml)
print style.tostring(result)