FAQ: Binary Search Trees: Python - Traversing A Binary Search Tree

This community-built FAQ covers the “Traversing A Binary Search Tree” exercise from the lesson “Binary Search Trees: Python”.

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Pass the Technical Interview with Python

FAQs on the exercise Traversing A Binary Search Tree

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Could you please explain why in binary tree traversal the print function is only done for the left child, but at the output we receive all tree?

There might be a bug at step 4. This is the method I wrote:

  def depth_first_traversal(self):
    if self.left:
    print(f'Depth={self.depth}, Value={self.value}')
    if self.right:

my solution for the code was not accepted. Also when I manually replaced my code with the offered solution it wouldn’t accept the input. Only by selecting the option to replace my code with the solution the input was accepted and I could continue the lesson.


Same problem over here, wrote exactly the same code, but it is not accepted.

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