p3

Given the root to a binary tree, implement serialize(root), which serializes the tree into a string, and deserialize(s), which deserializes the string back into the tree.

For example, given the following Node class

        class Node:
            def __init__(self, val, left=None, right=None):
                self.val = val
                self.left = left
                self.right = right


        The following test should pass:

        node = Node('root', Node('left', Node('left.left')), Node('right'))
        assert deserialize(serialize(node)).left.left.val == 'left.left'