def run(self, root):
    '\n        Subclasses of Treeprocessor should implement a `run` method, which\n        takes a root ElementTree. This method can return another ElementTree \n        object, and the existing root ElementTree will be replaced, or it can \n        modify the current tree and return None.\n        '
    pass
Subclasses of Treeprocessor should implement a `run` method, which
takes a root ElementTree. This method can return another ElementTree 
object, and the existing root ElementTree will be replaced, or it can 
modify the current tree and return None.
def run(self, root):
    '\n        Subclasses of Treeprocessor should implement a `run` method, which\n        takes a root ElementTree. This method can return another ElementTree \n        object, and the existing root ElementTree will be replaced, or it can \n        modify the current tree and return None.\n        '
    pass