Python programmers can now use the Apache XML Project's Xalan XSLT processor thanks to Pyana.

Currently at version 0.1.0, Pyana is available as Windows binaries or as source code from Pyana's CVS repository. Pyana allows the definition of XPath extension functions in Python. Announcing release 0.1.0, Brian Quinlan gave the following example usage:

def sum(*args):
    """Compute the sum of all arguments"""
    s = 0
    for i in args:
        s += i
    return s

Pyana.install( 'exampleNS', sum, 'sum' )
inputExampleXSL = r'''
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:py="exampleNS" version="1.0">
    <xsl:output method="text"/>
    <xsl:template match="message"><xsl:value-of
select="py:sum(1,2,3,4,5)"/></xsl:template>
</xsl:stylesheet>
'''
inputExampleXML = r'''
<message>ignored</message>
'''
print Pyana.transform(inputExampleXML, inputExampleXSL) # => '15'