<doocs>1339.Maximum Product of Splitted Binary Tree_2.py
def sum(root):
    if root is None:
        return 0
    return root.val + sum(root.left) + sum(root.right)
def sample_funcname ( var_1 ) :
    if var_1 is None :
        return 0
    return var_1.val + var_0 ( var_1.left ) + var_0 ( var_1.right )
