from mcpi.minecraft import Minecraft
mc = Minecraft.create()
import time
import minecraftstuff
import threading

brick = 45


def moveWall():
    pos = mc.player.getTilePos()
    wallPos = pos.clone()

    wallShape = minecraftstuff.MinecraftShape(mc, wallPos)
    wallShape.setBlocks(0, 0, 0, 0, 0, 9, brick)

    while True:
        wallShape.moveBy(0, 1, 0)     # Движение вверх
        time.sleep(1)
        wallShape.moveBy(0, -1, 0)    # Движение вверх
        time.sleep(1)


wall_t = threading.Thread(target=moveWall)
wall_t.start()

mc.postToChat('Эта команда запустилась')