(Not so) advanced xsl transformation of child nodes into list

Input:

<root>
    <aa><aaa/><bbb/><ccc/><ddd/><eee/></aa>
    <bb><ggg/></bb>
</root>

Desirable output:

<root>
    <aa>aaa<aa>
    <aa>bbb<aa>
    <aa>ccc<aa>
    <aa>ddd<aa>
    <aa>eee<aa>
    <bb>ggg</bb>
</root>

I've come up with the simple xslt but it properly handles only and doesn't create list of tags.

XSLT:

<xsl:stylesheet version="1.0" xmlns:xsl="http://ift.tt/tCZ8VR">
    <xsl:output method="xml" indent="yes" omit-xml-declaration="yes"/>
    <xsl:template match="@*|node()">
        <xsl:copy>
            <xsl:apply-templates select="@*|node()"/>
        </xsl:copy>
    </xsl:template>
    <!-- select all elements that doesn't have any child nodes (elements or text etc) -->
    <xsl:template match="//*[not(node())]">
        <xsl:value-of select="name()"/>
    </xsl:template>   
</xsl:stylesheet>

Output:

<root>
        <aa>aaabbbcccdddeee</aa>
        <bb>ggg</bb>
</root>

P.S. It is part of python script. Does it make to do such conversions using xslt in python script? Or python solution using simple xpath and python logic will work better?