class Node(object):
def __init__(self, value, left=None, right=None):
self.value = value
self.left = left
self.right = right
def insert_left(self, value):
self.left = Node(value)
return self.left
def insert_right(self, value):
self.right = Node(value)
return self.right
tree = Node(
50,
Node(
17,
Node(
12,
Node(9),
Node(14),
),
Node(
23,
Node(19),
),
),
Node(
72,
Node(
54,
None,
Node(67)
),
Node(76),
),
)