add file to run sudokus from keggle dataset

sudoku.py

@@ -1,7 +1,5 @@
 from copy import deepcopy
-from random import choice, randrange
-import pandas as pd
-import numpy as np
+from random import choice
 import sys
 
 class cell():
@@ -188,9 +186,11 @@ class sudoku_grid():
                 current_cell.collapse(current_set)
 
     def cleanup(self):
+        retval = [[self.grid[i][j].solution for j in range(9)] for i in range(9)]
         for i in range(9):
             for j in range(9):
                 self.grid[i][j].cleanup()
+        return retval
 
     def check_branching(self):
         if self.invalid_states():