Setting Bool in Element Tree in Python

I want to create a REST request paramter in which i am passing a bool using Element Tree in Python.Can anyone suggest how can i pass a bool in Element Tree.The below throws an error

root = ET.Element('dummy_create')
    ET.SubElement(root, 'name').text = name
    ET.SubElement(root, 'isEvaluate').text = True
    return ET.tostring(root)

I want isEvaluate to be a bool.Can someone suggest how to do it.i am getting below error now:

File "/usr/lib64/python2.6/xml/etree/ElementTree.py", line 777, in _raise_serialization_error
"cannot serialize %r (type %s)" % (text, type(text).__name__)TypeError: cannot serialize True (type bool)

Thanks