Created an arc drawing for each tile.

This was definitely trickier than the previous two examples we looked at, and there was a significant amount of trial
and error to get this functional. Specifically, having the turtle return to its original starting point was tricky as
there was a bug where the turtle would glitch around the screen before settling on its end point, which threw me off for
some time. Thankfully, I just began testing some different combinations one at a time until I achieved the desired outcome.

tile.py

@@ -3,26 +3,12 @@ from turtle import *
 def draw_tile(size):
     "Draws one tile, which can be repeated to form a pattern."
     draw_tile_outline(size)
-    draw_squiggle(size)
+    draw_greater_arc(size)
 
 def draw_tile_outline(size):
     pencolor("#dddddd")
     square(size)
 
-def draw_squiggle(size):
-    forward(size/4)
-    pencolor("black")
-    left(90)
-    quarter_arc_right(size/4)
-    quarter_arc_left(size/4)
-    quarter_arc_left(size/4)
-    quarter_arc_right(size/4)
-    left(90)
-    fly(size/4)
-    left(90)
-    fly(size)
-    left(90)
-
 def fly(distance):
     "Moves without drawing."
     penup()
@@ -42,3 +28,13 @@ def quarter_arc_right(radius):
 def quarter_arc_left(radius):
     "Draws a quarter of an arc, turning to the left."
     circle(radius, 90)
+
+def draw_greater_arc(size):
+    "Draw a full arc or half of a circle, turning to the left."
+    pencolor("black")
+    quarter_arc_left(size/2)
+    quarter_arc_left(size/2)
+    left(90)
+    fly(size)
+    left(90)
+    

tile_grid.py

@@ -10,7 +10,7 @@ from tile import fly
 def draw_tile_grid(width, height, tile_size, tile_function):
     """Draws a (width x height) grid, with tile_function drawn on each tile.
 
-    (Your explanation here.)
+    Uses the tile_size function to create an evenly distributed grid before returning to starting position.
     """
     for y in range(height):
         for x in range(width):