Added a to_str function for all classes. __str__ function uses it. highscores_data uses the to_str function for saving.

data/table.py

@@ -28,7 +28,7 @@ class Table:
         Returns:
             str: Table class as a string
         """
-        return json.dumps(self.to_dict(), indent=4)
+        return self.to_str()
 
     @classmethod
     def from_dict(cls, table_name: str, data: dict):
@@ -129,3 +129,12 @@ class Table:
             data["categories"][category.name] = category.to_dict()
 
         return data
+
+    def to_str(self) -> str:
+        """
+        Returns Table object as a string.
+
+        Returns:
+            str: string of json representation of Table
+        """
+        return json.dumps(self.to_dict(), indent=4)