Method isSameTree

Python/same_tree.py:16–22

(self, p: Optional[TreeNode], q: Optional[TreeNode])

#         self.right = right
class Solution:
    def isSameTree(self, p: Optional[TreeNode], q: Optional[TreeNode]) -> bool:
        if not p and not q:      #return true if both nodes are Null
            return True
        if not p or not q or p.val != q.val:   #return false if any of the root is Null or value of both roots is not equal
            return False
        
        return self.isSameTree(p.left , q.left) and self.isSameTree(p.right, q.right)