ElementTree XPath - Select Element based on attribute [closed]

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

def parse(document):
    root = et.parse(document)
    for target in root.findall("//target[@name='a']"):
        print target._children

expected path separator ([)