Just remove complete since it's actually not needed. We can stop the maze once find_coord doesn't find anything new.

phase_six.py

@@ -73,13 +73,6 @@ class Map:
                 result.append([x,y])
         return result
 
-    def complete(self, grid):
-        for y in range(1, self.height, 2):
-            for x in range(1, self.width, 2):
-                if(grid[y][x] != SPACE):
-                    return False
-        return True
-
     def hunt_and_kill(self, grid):
         on_x = 1
         on_y = 1
@@ -105,7 +98,6 @@ class Map:
                 grid[row][col] = SPACE
                 on_x, on_y = nb_x, nb_y
 
-        assert self.complete(grid), "Maze is not complete."
         return dead_ends