def getChildrenByTagName(node, tagName):
    for child in node.childNodes:
        if child.nodeType == child.ELEMENT_NODE and (tagName == '*' or 
            child.tagName == tagName):
            yield child
for topic in document.getElementsByTagName('Topic'):
    title = list(getChildrenByTagName('Title'))[0]
print(title.firstChild.data)
XML Parsing with Python and minidom