Grid

from Tkinter import *

def butts(Bx1, By1, Bx2, By2, x, y, dotSize):
    x-=1;y-=1
    WINDOW_WIDTH = 800
    WINDOW_HEIGHT = 600
    def fxrange(min,max,delta=1):
        r = min
        while r <= max:
            yield r
            r += delta
    def drawGrid(c, x1, y1, x2, y2, x, y):
        """Draws a complete grid (x by y) on Canvas c within the bounding box."""
        # calculate the spacing between each line (vertical and horizontal)
        sv = float((x2 - x1)) / float(x)
        sh = float((y2 - y1)) / float(y)

        # Draw the lines
        for i in fxrange(x1, x2, sv):
            c.create_line(i, y1, i, y2)
        for i in fxrange(y1, y2, sh):
            c.create_line(x1, i, x2, i)
    def drawDots(c, x1, y1, x2, y2, x, y, size=dotSize):
        """Draws a complete grid (x by y) of dots on Canvas c within the bounding box."""
        # calculate the spacing between each line (vertical and horizontal)
        sx = float(x2 - x1) / float(x)
        sy = float(y2 - y1) / float(y)

        for tx in fxrange(x1, x2, sx):
            for ty in fxrange(y1, y2, sy):
                # calculate the bounding box of the circle
                ts = float(size) / 2
                box_x1 = tx - ts
                box_y1 = ty - ts
                box_x2 = tx + ts
                box_y2 = ty + ts

                # draw the circle
                c.create_oval(box_x1, box_y1, box_x2, box_y2, fill="black")
    master = Tk()
    w = Canvas(master, width=WINDOW_WIDTH, height=WINDOW_HEIGHT)
    w.pack()
    drawGrid(w, Bx1, By1, Bx2, By2, x, y)
    drawDots(w, Bx1, By1, Bx2, By2, x, y)
    mainloop()

butts(10, 10, 600, 600, 50, 50, 7)