Initial commit

grid.py

@@ -0,0 +1,17 @@
+from turtle import *
+
+GRID_ROWS = 8
+
+def draw_square(unit):
+    for i in range(4):
+        forward(unit)
+        left(90)
+
+def draw_grid(unit):
+    "Draws a grid, with `unit` as the spacing."
+    for cycle in range(2):
+        for i in range(GRID_ROWS + 1):
+            draw_square(i * unit)
+        for side in range(2):
+            forward(GRID_ROWS * unit)
+            left(90)