Used Python to Find Diamond Ore in Minecraft

I have been working on learning Python by creating mods in Minecraft.  Working my way through this Learn to Program With Minecraft book and I decided to modify one of the missions in chapter four that talks about posting a message to the users.  Well one message that I have always wanted to see is if there are diamonds around me.  I wrote a script with some loop nesting and slow as can be, but it finds diamond ore and posts a message with position values so I can find them.  Below is that script.

from mcpi.minecraft import Minecraft
from mcpi.minecraft import Block
mc = Minecraft.create()

pos = mc.player.getPos()
distance = 10
totalCheck = 0
for x in range(int(pos.x), int(pos.x + distance)):
    for y in range(4, 17):
        for z in range(int(pos.z), int(pos.z + distance)):
                blockId = mc.getBlock(x, y, z)
                totalCheck += 1
                if (blockId == 56):
                    mc.postToChat("block: " + str(blockId) + "x: " + str(x) + " y: " + str(y) + " z: " + str(z))

mc.postToChat("Total blocks checked: " + str(totalCheck))