不不不，我的意思是上述AVL模块和BST模块结合的全代码，能否说明一下

好的，下面是一个简单的示例代码，它实现了一个基本的AVL树结构，其中包含插入、删除和查找操作：

class AVLNode:
    def __init__(self, key):
        self.key = key
        self.left = None
        self.right = None
        self.height = 1

class AVLTree:
    def insert(self, root, key):
        if not root:
            return AVLNode(key)
        elif key < root.key:
            root.left = self.insert(root.left, key)
        else:
            root.right = self.insert(root.right, key)

        root.height = 1 + max(self.getHeight(root.left),
                              self.getHeight(root.right))

        balance = self.getBalance(root)

        if balance > 1 and key < root.left.key:
            return self.rightRotate(root)

        if balance < -1 and key > root.right.key:
            return self.leftRotate(root)

        if balance > 1 and key > root.left.key:
            root.left = self.leftRotate(root.left)
            return self.rightRotate(root)

        if balance < -1 and key < root.right.key:
            root.right = self.rightRotate(root.right)
            return self.leftRotate(root)

        return root

    def delete(self, root, key):
        if not root:
            return root

        elif key < root.key:
            root.left = self.delete(root.left, key)

        elif key > root.key:
            root.right = self.delete(root.right, key)

        else:
            if root.left is None:
                temp = root.right
                root = None
                return temp

            elif root.right is None:
                temp = root.left
                root = None
                return temp

            temp = self.getMinValueNode(root.right)
            root.key = temp.key
            root.right = self.delete(root.right,
                                      temp.key)

        if root is None:
            return root

        root.height = 1 + max(self.getHeight(root.left),
                              self.getHeight(root.right))

        balance = self.getBalance(root)

        if balance > 1 and self.getBalance(root.left) >= 0:
            return self.rightRotate(root)

        if balance < -1 and self.getBalance(root.right) <= 0:
            return self.leftRotate(root)

        if balance > 1 and self.getBalance(root.left) < 0:
            root.left = self.leftRotate(root.left)
            return self.rightRotate(root)

        if balance < -1 and self.getBalance(root.right) > 0:
            root.right = self.rightRotate(root.right)
            return self.leftRotate(root)

        return root

    def search(self, root, key):
        if not root:
            return None
        elif root.key == key:
            return root
        elif root.key > key:
            return self.search(root.left, key)
        else:
            return self.search(root.right, key)

    def getHeight(self, root):
        if not root:
            return 0

        return root.height

    def getBalance(self, root):
        if not root:
            return 0

        return self.getHeight(root.left) - self.getHeight(root.right)

    def leftRotate(self, z):
        y = z.right
        T2 = y.left

        y.left = z
        z.right = T2

        z.height = 1 + max(self.getHeight(z.left),
                           self.getHeight(z.right))
        y.height = 1 + max(self.getHeight(y.left),
                           self.getHeight(y.right))

        return y

    def rightRotate(self, z):
        y = z.left
        T3 = y.right

        y.right = z
        z.left = T3

        z.height = 1 + max(self.getHeight(z.left),
                           self.getHeight(z.right))
        y.height = 1 + max(self.getHeight(y.left),
                           self.getHeight(y.right))

        return y

    def getMinValueNode(self, root):
        if root is None or root.left is None:
            return root

        return self.getMinValueNode(root.left)

这个代码实现了一个基本的AVL树，其中包含了insert、delete和search等操作。与BST不同的是，AVL树在插入和删除节点时，会自动平衡树以保持树的平衡性。