Sandbox::https://github.com/prashanthigupta/leetcode-algorithms/blob/master/python/binary_tree

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from typing import List

# Definition for a binary tree node.

class TreeNode:

def __init__(self, val=0, left=None, right=None):

self.val = val

self.left = left

self.right = right

class Solution:

def is_leaf_node(self, root: TreeNode) -> bool:

return root.left is None and root.right is None

def binary_tree_paths(self, root: TreeNode, current_path: str, results: List[str]):

if root is None:

return

if self.is_leaf_node(root):

results.append(f'{current_path}->{root.val}'[2:])

return

self.binary_tree_paths(root.left, f'{current_path}->{root.val}', results)

self.binary_tree_paths(root.right, f'{current_path}->{root.val}', results)

def binaryTreePaths(self, root: TreeNode) -> List[str]:

result = []

self.binary_tree_paths(root, '', results=result)

return result