Как записать динамически формируемую строку в фильтре для MCedit?

# command block filter 
 
 
from copy import deepcopy
from pymclevel import TAG_List
from pymclevel import TAG_Byte
from pymclevel import TAG_Int
from pymclevel import TAG_Compound
from pymclevel import TAG_Short
from pymclevel import TAG_Double
from pymclevel import TAG_String
from pymclevel import TileEntity
 
displayName = "Command Block Filter"
 
player_list = (
    "@p",
    "@r",
    "@a",
    "@f"
)
 
 
fnoop = -1337.0
inputs = (
  ("Target",player_list),
  ("Destination X",fnoop),
  ("Destination Y",fnoop),
  ("Destination Z",fnoop)
)
 
def perform(level, box, options):
 
        targ = options["Target"]
 
     
 
 
 
    for (chunk, slices, point) in level.getChunkSlices(box):
        for e in chunk.TileEntities:
            x = e["x"].value
            y = e["y"].value
            z = e["z"].value
            if x >= box.minx and x < box.maxx and y >= box.miny and y < box.maxy and z >= box.minz and z < box.maxz:
                if e["id"].value == "Control":
 
 
                    e["Command"] = TAG_String( "/testfor "+ targ + "[" + `x` + "," + `y` + "," + `z` )
        chunk.dirty = True

e["Command"] = TAG_String( "/testfor "+ targ + "[" + `x` + "," + `y` + "," + `z` )

/testfor @p[x,y,z,1]

( "/testfor "+ targ + "[" + `x` + "," + `y` + "," + `z` + ",1] )

( "/testfor "+ targ + "[" + `x` + "," + `y` + "," + `z` )