_Node.py 文件源码

def attachChild(self, newChild, index = None):
        """
        Attach a (parentless) child. If the child has a parent
        already, call its reattach method
        """
        # Don't allow bidirectional parenthood
        assert not self is newChild
        if newChild.parent():
            raise AttachmentError('Cannot attach node: %s to: %s Node is already attached to %s' \
            % (newChild.prettyPrint(), self.prettyPrint(), newChild.parent().prettyPrint()))
        if index == None:
            if not self._children:
                self._children.append(newChild)
            else:
                bisect.insort_right(self._children, newChild)
        else:
            self._children.insert(index, newChild)
        newChild.setParent(self)