How to assign dynamic value in find in xpath pytho

Question

I have a xml file

<root>
<emps>
<employee title="abc">ABC</employee>
<employee title="gef">GEF</employee>
<!-- <employee title="abc">
ABC
</employee>
-->
</emps>
</root>

I want to delete some employee details from this file. Employee details to be deleted are mentioned in other file delemp.txt abc gh

import xml.etree.ElementTree as ET
class CommentedTreeBuilder(ET.XMLTreeBuilder):
    def __init__(self, *args, **kwargs):
        super(CommentedTreeBuilder, self).__init__(*args, **kwargs)
        self._parser.CommentHandler = self.comment

    def comment(self, data):
        self._target.start(ET.Comment, {})
        self._target.data(data)
        self._target.end(ET.Comment)


parser=CommentedTreeBuilder()
tree = ET.parse('emps.xml', parser)

#tree = ET.parse('emps.xml')
root = tree.getroot()
for e in root.iter('employee'):
    print(e.attrib)

val = 'abc'
#mv1 = root.find("./employee[@title='abc']")
#root.remove(mv1)
#th='//employee[title()="'+val'"]'
#xpath='//employee[title()="'+val+'"]'
#mv2 = root.find(xpath)
#print mv2
#root.remove(mv2)
mmm = root.find("//employee[@title='{}']".format(val))
print mmm
root.remove(mmm)
#"//*[@text='{}']".format(email)
tree.write("emps.xml")

tree = ET.parse('emps.xml')
root = tree.getroot()

for movie in root.iter('employee'):
    print(e.attrib)

I am trying to delete xml node. If I give static value as name='abc' in xpath it is working but if I try to give dynamic value it is not working.Please help me