#4 rather efficient impl. using the json lib.

data/entity.py

@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+import json
 
 class Player:
     def __init__(self, id_, name_, position_, cash_):
@@ -8,11 +9,7 @@ def __init__(self, id_, name_, position_, cash_):
         self.cash = cash_
 
     def toJson(self):
-        id_str =  "id : " + str(self.id)
-        name_str = "name : " + self.name
-        position_str = "position : " + str(self.position)
-        cash_str = "cash : " + str(self.cash)
-        return "{" + id_str + " , "+ name_str + " , "+ position_str + " , "+ cash_str + "}"
+        return json.dumps(self)
 
 class Cell:
     def __init__(self, id_, type_, owner_):
@@ -21,10 +18,7 @@ def __init__(self, id_, type_, owner_):
         self.owner = owner_
 
     def toJson(self):
-        id_str = "id : " + str(self.id)
-        type_str = "type : " + str(self.type)
-        owner_str = "owner : " + str(self.owner)
-        return "{" + id_str + " , " + type_str + " , " + owner_str + " , " + "}"
+        return json.dumps(self)
 
 
 class Board:
@@ -38,5 +32,4 @@ def __new__(cls):
         return cls._instance
 
     def toJson(self):
-        cells_str = "cells_str : " + " , ".join( map( lambda c:c.toJson() , self.cells.toJson() ) )
-        return "{ " + cells_str + " }"
+        return json.dumps(self)