import rhinoscriptsyntax as rs
import random as ran

allobj= rs.AllObjects()
rs.DeleteObjects(allobj)

bsize=10   #side length of box
dist=1     #distance between boxes
offs=bsize + dist    #offset of boxes
num=30   #number of boxes in ine row

#create a box
corners = [(0,0,0),(bsize,0,0) ,(bsize,bsize,0) ,(0,bsize,0),
          (0,0,bsize),(bsize,0,bsize),(bsize,bsize,bsize),(0,bsize,bsize)]


#rs.AddBox(corners)

rs.EnableRedraw(False)


for i in range(num):
    for j in range(num):
        if((i-j+5)%4) and ((i+j)%3):
             mybox=rs.AddBox(corners)
             rs.MoveObject(mybox,(i*offs,j*offs,0))

rs.EnableRedraw(True)