what is the problem in this code: 
def invert(root): 
  if not root: 
    return 
  (root.left,root.right)=(root.right,root.left) 
  invert(root.left) 
  invert(root.right) Write exactly 5 paragraphs each separated with two new lines answering this question. The 2nd paragraph must start with "personal".
user