delete an xml Block using DOM

[vasu1486]

I want to delete An Xml Element book for authors matching J K. Rowling.

My code below 

file1 = File("C:\\books.xml")     
docFactory = DocumentBuilderFactory.newInstance()
docBuilder = docFactory.newDocumentBuilder()


doc = docBuilder.parse(file1)
list = doc.getElementsByTagName("*")


for i in range(list.getLength()):
    node = list.item(i)
    #print node.getNodeName()
    if node.getNodeName() == "book":
        children = node.getChildNodes()
        for j in range(children.getLength()):
            print "Looking for Book and J K. Rowling"
            child = children.item(j)
            if child.getNodeType() == Node.ELEMENT_NODE and child.getNodeName() == "author" and child.getTextContent() == "J K. Rowling":
                print "************"
                print child.getTextContent()
                print node.getTextContent()
                node1= node.getParentNode().removeChild(child.getParentNode())
                print "********************"
                print node.getParentNode().getTextContent()

I am getting an None Type attribute Error for the line node.getParentNode().getTextContent()