elementtree xpath - name component formed attribute

i am carrying problem controlling charge xpath selector elementtree, i should means according

here's illustration code

xml

<root>
 <target name="1">
    <a></a>
    <b></b>
 </target>
 <target name="2">
    <a></a>
    <b></b>
 </target>
</root>

python

def parse(document):
    bottom = et.parse(document)
    aim root.findall("//target[@name='a']"):
        imitation target._children

i am receiving following exception:

expected route separator ([)

code1