Blender step making script

# tested on Blender 2.78
import bpy

numSteps = 20
stpWid   = 1
stpLen   = 4
stp1Hgt  = 1
stpIncr  = 0.1

# clean the slate (delete all objects in scene)
bpy.ops.object.select_all(action='SELECT') # select everything
bpy.ops.object.delete(use_global=False) # delete selected

def makeCuboid(dim,loc):
    bpy.ops.mesh.primitive_cube_add(radius=0.5, location=loc )
    bpy.ops.transform.resize(value=dim, constraint_axis=(True, True, True))

xLoc,yLoc,zLoc = stpWid/2,stpLen/2,stp1Hgt/2
CurrStpHgt = stp1Hgt

for i in range(numSteps):
    makeCuboid([stpWid,stpLen,CurrStpHgt],[ xLoc,yLoc,zLoc ] )
    CurrStpHgt = CurrStpHgt + stpIncr
    xLoc,yLoc,zLoc = xLoc+stpWid,yLoc,zLoc+CurrStpHgt-stpIncr/2