def getRandomBinaryTreeLeafNode(binaryTree):
    """Get random binary tree node.
    """
    if binaryTree.internal == True:
        if random.random() > 0.5:
            return getRandomBinaryTreeLeafNode(binaryTree.left)
        else:
            return getRandomBinaryTreeLeafNode(binaryTree.right)
    else:
        return binaryTree
Get random binary tree node.