added sudoku logic, trying to get board to print

board.py

@@ -0,0 +1,89 @@
+import random
+
+from cell import Cell
+
+
+class Board:
+
+    def __init__(self):
+
+        self.grid = [[0 for _ in range(9)] for _ in range(9)]
+        self.cells = []
+
+    def generate(self):
+
+        self._fill_board()
+
+        self.create_cells()
+
+    def create_cells(self):
+
+        self.cells = []
+
+        for row in range(9):
+
+            for col in range(9):
+
+                self.cells.append(
+                    Cell(
+                        row=row,
+                        col=col,
+                        value=self.grid[row][col]
+                    )
+                )
+
+    def _find_empty(self):
+
+        for row in range(9):
+
+            for col in range(9):
+
+                if self.grid[row][col] == 0:
+                    return row, col
+
+        return None
+
+    def _valid(self, row, col, num):
+
+        if num in self.grid[row]:
+            return False
+
+        for r in range(9):
+            if self.grid[r][col] == num:
+                return False
+
+        box_row = (row // 3) * 3
+        box_col = (col // 3) * 3
+
+        for r in range(box_row, box_row + 3):
+            for c in range(box_col, box_col + 3):
+
+                if self.grid[r][c] == num:
+                    return False
+
+        return True
+
+    def _fill_board(self):
+
+        empty = self._find_empty()
+
+        if empty is None:
+            return True
+
+        row, col = empty
+
+        nums = list(range(1, 10))
+        random.shuffle(nums)
+
+        for num in nums:
+
+            if self._valid(row, col, num):
+
+                self.grid[row][col] = num
+
+                if self._fill_board():
+                    return True
+
+                self.grid[row][col] = 0
+
+        return False