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Create Binary Tree From Numbers As They Are Feeded

Here is a method to create Binary Tree from numbers as they are feeded (which means without sorting first)
class Node():
def __init__(self, value, left=None, right=None):
self.value = value
self.left = left
self.right = right


class BinaryTree():
def __init__(self):
self.root=Node(None)

def add(self, value):
self.curr=self.root
self._add(value)
def _add(self, value):
if self.curr.value == None:
self.curr.value = value
else:
if self.curr.value > value:
if self.curr.left == None:
self.curr.left = Node(value)
else:
self.curr = self.curr.left
self._add(value)
else:
if self.curr.right == None:
self.curr.right = Node(value)
else:
self.curr = self.curr.right
self._add(value)

obj = BinaryTree()
obj.add(10)
obj.add(5)
obj.add(15)
obj.add(3)
obj.add(17)
obj.add(13)
obj.add(8)
obj.add(18)
obj.add(1)
obj.add(11)
obj.add(9)
obj.add(2)
obj.add(16)
obj.add(6)
obj.add(4)
obj.add(12)
obj.add(14)
obj.add(7)
obj.add(19)
obj.add(20)
obj.add(21)

print("Root Value: {}".format(obj.root.value))
print("Root's Left Value: {}".format(obj.root.left.value))
print("Root's right Value: {}".format(obj.root.right.value))
print("Root's Left's Left Value: {}".format(obj.root.left.left.value))
print("Root's Left's right Value: {}".format(obj.root.left.right.value))
print("Root's Right's Left Value: {}".format(obj.root.right.left.value))
print("Root's Right's right Value: {}".format(obj.root.right.right.value))

Output

Root Value: 10
Root's Left Value: 5
Root's right Value: 15
Root's Left's Left Value: 3
Root's Left's right Value: 8
Root's Right's Left Value: 13
Root's Right's right Value: 17

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