Dots and lines in SVG format

dots.py

import drawsvg as draw
import math
import random
spacing = 7
stroke = 0.5

rows, cols = (200, 200)
arr = [[0]*(cols*2)]*(rows*2)

d = draw.Drawing(450, 450, origin='center')
for x in (range(-cols, rows, spacing+1)):
    for y in (range(-cols, rows, spacing+1)):
        size = random.randint(1,spacing)
        if (size > 1):
            arr[x][y] = size
            if ((x > -200) and (y > -200)):
                if (size > spacing * .9):
                    d.append(draw.Line(x,y,x-spacing-1,y, stroke_width=stroke, stroke='black'))
                if (size < spacing * .5):
                    d.append(draw.Line(x,y,x-spacing-1,y-spacing-1, stroke_width=stroke, stroke='black'))    
                if (size < spacing * .5):
                    if (y < 190):
                        d.append(draw.Line(x,y,x-spacing-1,y+spacing+1, stroke_width=stroke, stroke='black')) 
                if (size > spacing * .9):
                    d.append(draw.Line(x,y,x,y-spacing-1, stroke_width=stroke, stroke='black'))
for x in (range(-cols, rows, spacing+1)):
    for y in (range(-cols, rows, spacing+1)):
        size = random.randint(1,spacing)
        if (size > 1):
            if (arr[x][y] > 0):
                d.append(draw.Circle(x, y, size/2, fill='white', stroke_width=stroke, stroke='black'))
d.save_svg('stuff.svg')
d  # Display as SVG