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    "import import_ipynb\n",
    "import PGenType\n",
    "#import Rel_Attrib\n",
    "\n",
    "class PTuple():\n",
    "    \n",
    "    def __init__(self, attrib_list = None, *args):\n",
    "        #list of objects of types PInt, PReal, ...\n",
    "        self.attrib_list = []\n",
    "        if attrib_list is not None:\n",
    "            self.attrib_list = attrib_list\n",
    "        #list of types of objects\n",
    "        self.attrib_types = [genType for genType in args]\n",
    "    \n",
    "    def add_attrib_types(self, genType):\n",
    "        self.attrib_types.append(genType)\n",
    "        \n",
    "    def get_attrib_type(self, index):\n",
    "        return self.attrib_types[index]\n",
    "    \n",
    "    def get_attrib_types(self):\n",
    "        return self.attrib_types\n",
    "    \n",
    "    def get_attribs(self):\n",
    "        return self.attrib_list\n",
    "    \n",
    "    def __eq__(self, obj):\n",
    "        if obj == self:\n",
    "            return True\n",
    "        if obj is None:\n",
    "            return False\n",
    "        if not isinstance(obj, PTuple):\n",
    "            return False\n",
    "        otherTuple = PTuple()\n",
    "        otherTuple = obj\n",
    "        if not(len(self.attrib_types) == len(otherTuple.get_attrib_types())):\n",
    "            return False\n",
    "        for idx, att in enumerate(self.attrib_types):\n",
    "            if not(att == otherTuple.get_attrib_type(idx)):\n",
    "                return False\n",
    "        return True\n",
    "\n",
    "    # usage: tuple = PTuple.create_tuple_instance(rel_attrib_list)\n",
    "    @classmethod\n",
    "    def create_tuple_instance(cls, attrib_list):\n",
    "         return cls(attrib_list)\n"
   ]
  },
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