How to add the sum of cubes using a function in python?

var geometry = new THREE.CubeGeometry(width, height, depth, 1, 10, 1);

class Point3D:
    """Representation of a point in 3D space."""
    def __init__(self, x, y, z):
        self.x = x
        self.y = y
        self.z = z

    def __add__(self, other):
        """Add two points.

        >>> Point3D(1, 2, 3) + Point3D(100, 200, 300)
        Point3D(101, 202, 303)
        """
        x = self.x + other.x
        y = self.y + other.y
        z = self.z + other.z
        return Point3D(x, y, z)

    def __mul__(self, a):
        """Multiply a point with a number.

        >>> Point3D(1, 2, 3) * 2
        Point3D(2, 4, 6)
        """
        x = self.x * a
        y = self.y * a
        z = self.z * a
        return Point3D(x, y, z)

    def __rmul__(self, a):
        """Multiply a number with a point.

        >>> 2 * Point3D(1, 2, 3)
        Point3D(2, 4, 6)
        """
        return self.__mul__(a)

    def __repr__(self):
        return 'Point3D({p.x}, {p.y}, {p.z})'.format(p=self)

from __future__ import division
from itertools import product

class Cube:
    """Representation of a cube."""

    # directions to all eight corners of a cube
    DIR = [Point3D(*s) for s in product([-1, +1], repeat=3)]

    def __init__(self, center, size, depth=0):
        if not isinstance(center, Point3D):
            center = Point3D(*center)
        self.center = center
        self.size = size
        self.depth = depth

    def __repr__(self):
        return 'Cube(center={c.center}, size={c.size}, depth={c.depth})'.format(c=self)

    def _divide(self):
        """Divide into eight cubes of half the size and one level deeper."""
        c = self.center
        a = self.size/2
        d = self.depth - 1
        return [Cube(c + a/2*e, a, d) for e in Cube.DIR]

    def divide(self, target_depth=0):
        """Recursively divide down to the given depth and return a list of
        all 8^d cubes, where d is the difference between the depth of the
        cube and the target depth, or 0 if the depth of the cube is already
        equal to or less than the target depth.

        >>> c = Cube(center=(0, 0, 0), size=2, depth=1)
        >>> len(c.divide(0))
        8
        >>> len(c.divide(-1))
        64
        >>> c.divide(5)[0] is c
        True
        >>> c.divide(-1)[0].size
        0.5
        """
        if self.depth <= target_depth:
            return [self]
        smaller_cubes = self._divide()
        return [c for s in smaller_cubes for c in s.divide(target_depth)]

# minDepthLevel = 0
# grid = {}
# grid[(1.5,0,0)] = [1,2]
# not sure what this ^ 1 means

cube = Cube((1.5, 0, 0), 4, 2)
grid = {c.center: [1, c.depth] for c in cube.divide(0)}

import maya.cmds as cmds
import random

cubeList = cmds.ls( 'Tiles*' )
if len(cubeList) > 0:
    cmds.delete( cubeList )

#create row and col list
cols = 10 # number of tiles to create
x = 1 # increment variable
arr = []
allTilesSpace = [] # cumalated space between tiles
for col in xrange (cols):
    # if there is no tile to create, do nothing
    if not cols:
        break
    # get the names of the objects
    currentTile = 'Tiles%d' % x
    previousTile = "Tiles%d" % (x - 1)
    # set random width
    width_rand_Size = random.uniform(0.8,3)
    arr.append(cmds.polyCube (ax = (0,0,1), w = width_rand_Size, h = 1, d =1 , n=currentTile))

    # Move the tiles
    currentTileWidth = cmds.polyCube(currentTile, q = 1, w = 1)
    if cmds.objExists(previousTile):
        previousTileWidth = cmds.polyCube(previousTile, q = 1, w = 1)
        allTilesSpace.append(previousTileWidth)
        tilesSpace = sum(allTilesSpace) + (currentTileWidth / 2)
        cmds.setAttr(currentTile + ".tx",tilesSpace)
    else:
        cmds.setAttr(currentTile + ".tx", currentTileWidth / 2)

    x += 1 # increment