FAQ: Trees: Python - Tree Review


#1

This community-built FAQ covers the “Tree Review” exercise from the lesson “Trees: Python”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Computer Science

Complex Data Structures

FAQs on the exercise Tree Review

There are currently no frequently asked questions associated with this exercise – that’s where you come in! You can contribute to this section by offering your own questions, answers, or clarifications on this exercise. Ask or answer a question by clicking reply (reply) below.

If you’ve had an “aha” moment about the concepts, formatting, syntax, or anything else with this exercise, consider sharing those insights! Teaching others and answering their questions is one of the best ways to learn and stay sharp.

Join the Discussion. Help a fellow learner on their journey.

Ask or answer a question about this exercise by clicking reply (reply) below!

Agree with a comment or answer? Like (like) to up-vote the contribution!

Need broader help or resources? Head here.

Looking for motivation to keep learning? Join our wider discussions.

Learn more about how to use this guide.

Found a bug? Report it!

Have a question about your account or billing? Reach out to our customer support team!

None of the above? Find out where to ask other questions here!


#2

Hi again I am confused How method traverse work with this line of code nodes_to_visit = [self] do we call self. value or do we call self.children or maybe self like whole TreeNode class with this line I can’t get it, what exactly we assign

class TreeNode:
  def __init__(self, value):
    self.value = value # data
    self.children = [] # references to other nodes

  def add_child(self, child_node):
    # creates parent-child relationship
    print("Adding " + child_node.value)
    self.children.append(child_node) 
    
  def remove_child(self, child_node):
    # removes parent-child relationship
    print("Removing " + child_node.value + " from " + self.value)
    self.children = [child for child in self.children 
                     if child is not child_node]

  def traverse(self):
    # moves through each node referenced from self downwards
    nodes_to_visit = [self]
    while len(nodes_to_visit) > 0:
      current_node = nodes_to_visit.pop()
      print(current_node.value)
      nodes_to_visit += current_node.children