add: data generator

Board/__init__.py

@@ -15,6 +15,10 @@ class Board:
             self.lives.add((x, y))
 
     def evaluate(self):
+        new_lives = self.try_evaluate()
+        self.lives = new_lives
+
+    def try_evaluate(self) -> set[(int, int)]:
         new_lives = set()
         for (x, y) in itertools.product(range(self.width), range(self.height)):
             neighbor_count = 0
@@ -33,5 +37,18 @@ class Board:
                 new_lives.add((x, y))
             if (x, y) not in self.lives and neighbor_count == 3:
                 new_lives.add((x, y))
-        self.lives = new_lives
+        return new_lives
 
+    def __str__(self):
+        res = ""
+        for y in range(self.height):
+            for x in range(self.width):
+                if (x, y) in self.lives:
+                    res += "o"
+                else:
+                    res += " "
+            res += "\n"
+        return res
+
+    def __repr__(self):
+        return self.__str__()