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#!/usr/bin/python
import mcpi.minecraft
import time

mc = mcpi.minecraft.Minecraft.create();

while True:
    hits = mc.events.pollBlockHits()
    for hit in hits:
            block = mc.getBlockWithData(hit.pos.x, hit.pos.y, hit.pos.z);
            block.data = (block.data + 1) & 0xf;
            mc.setBlock(hit.pos.x, hit.pos.y, hit.pos.z, block.id, block.data)
            mc.postToChat("Block data is now " + str(block.data))
    time.sleep(0.1)