Random replace

from pymclevel import MCSchematic
from pymclevel import TileEntity
from pymclevel import TAG_Compound
from pymclevel import TAG_Short
from pymclevel import TAG_Byte
from pymclevel import TAG_String
import random

displayName = "Random Replace"

inputs = (
    ("Replace", "blocktype"),
    ("With", "blocktype"),
    ("Chance", (50, 0, 100))
)

def perform(level, box, options):
    mat1 = options["Replace"]
    mat2 = options["With"]
    chance = options["Chance"]
    for x in xrange(box.minx, box.maxx):
        for y in xrange(box.miny, box.maxy):
            for z in xrange(box.minz, box.maxz):
                if level.blockAt(x, y, z) == mat1.ID and level.blockDataAt(x, y, z) == mat1.blockData:
                    if randomGen() <= chance:
                        level.setBlockAt(x, y, z, mat2.ID)
                        level.setBlockDataAt(x, y, z, mat2.blockData)
    level.markDirtyBox(box)
def randomGen():
    return int(random.random() * 100)