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

pos = mc.player.getTilePos()

x, y, z = pos.x, pos.y, pos.z

while True:
    x += random.uniform(-0.2, 0.2)
    z += random.uniform(-0.2, 0.2)
    y = mc.getHeight(x, z)

    mc.player.setPos(x, y, z)

    time.sleep(0.1)