二叉树的python实现

class (object):
    """节点"""
    def __init__(self, value):
        self.value = value
        self.left = None
        self.right = None

    def get_val(self):
        return self.value

class BinaryTree(object):
    """树"""
    def __init__(self):
        self.root = None

    def add_node(self, node):
        if not self.root:
            self.root = node
        else:
            root = self.root
            while True:
                if root.value >= node.value:
                    if root.left:
                        root = root.left
                        continue
                    else:
                        root.left = node
                        break
                else:
                    if root.right:
                        root = root.right
                    else:
                        root.right = node
                        break

def mid_traverse(tree):
    """中序遍历"""
    if not tree:
        return
    mid_traverse(tree.left)
    print(tree.value)
    mid_traverse(tree.right)

if __name__ == '__main__':
    n1 = Node(5)
    n2 = Node(4)
    n3 = Node(6)
    n4 = Node(3)
    n5 = Node(7)
    n6 = Node(2)
    n7 = Node(8)

    tree = BinaryTree()
    for i in [n1, n2, n3, n4, n5, n7, n6]:
        tree.add_node(i)

    mid_traverse(tree.root)