先建立二叉樹節點，有一個data數據域，left，right 兩個指針域
代碼如下:
# -*- coding: utf - 8 - *-

                 
class TreeNode(object):

    def __init__(self, left=0, right=0, data=0):
        self.left = left
        self.right = right
        self.data = data

代碼如下:
class BTree(object):

    def __init__(self, root=0):
        self.root = root

手動建立二叉樹

代碼如下:
node1 = TreeNode(data=1)
node2 = TreeNode(node1, 0, 2)
node3 = TreeNode(data=3)
node4 = TreeNode(data=4)
node5 = TreeNode(node3, node4, 5)
node6 = TreeNode(node2, node5, 6)
node7 = TreeNode(node6, 0, 7)
node8 = TreeNode(data=8)
root = TreeNode(node7, node8, 'root')

bt = BTree(root)

然后會生成下面的二叉樹
代碼如下:
# 生成的二叉樹

# ------------------------
#          root
#       7        8
#     6
#   2   5
# 1    3 4
#
# -------------------------

除了 手動一個個的制定 node 節點，還可以創建一個 create 方法，接受用戶輸入添加二叉樹節點。。。使用前續方式添加 ，代碼如下：
代碼如下:
# -*- coding: utf - 8 - *-

           
class TreeNode(object):

    def __init__(self, left=0, right=0, data=0):
        self.left = left
        self.right = right
        self.data = data

           
class BTree(object):

    def __init__(self, root=0):
        self.root = root

    def is_empty(self):
        if self.root is 0:
            return True
        else:
            return False

    def create(self):
        temp = input('enter a value:')
        if temp is '#':
            return 0
        treenode = TreeNode(data=temp)
        if self.root is 0: