7) classes and instances.ipynb

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  {
   "cell_type": "markdown",
   "id": "7e7cecd6",
   "metadata": {},
   "source": [
    "## Classes"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "d5cde69b",
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   "outputs": [],
   "source": [
    "class Dog:\n",
    "    def __init__(self, name):\n",
    "        self.name = name\n",
    "        self.legs = 4\n",
    "    \n",
    "    def speak(self):\n",
    "        print(self.name + ' says: Bark!')\n",
    "        \n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "5b3dde35",
   "metadata": {},
   "outputs": [],
   "source": [
    "my_dog = Dog('Sandra')\n",
    "another_dog = Dog('Leo')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "ceed1af6",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Sandra says: Bark!\n"
     ]
    }
   ],
   "source": [
    "my_dog.speak()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "b85ea67b",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Leo says: Bark!\n"
     ]
    }
   ],
   "source": [
    "another_dog.speak()"
   ]
  },
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   "attachments": {},
   "cell_type": "markdown",
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   "metadata": {},
   "source": [
    "## Class Inheritance"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "5d1838eb",
   "metadata": {},
   "outputs": [],
   "source": [
    "class Dog:\n",
    "    _legs = 4\n",
    "    def __init__(self, name):\n",
    "        self.name = name\n",
    "\n",
    "    def speak(self):\n",
    "        print(self.name + ' says: Bark!')\n",
    "    \n",
    "    def getLegs(self):\n",
    "        return self._legs\n",
    "\n",
    "\n",
    "class Chihuahua(Dog):\n",
    "    def speak(self):\n",
    "        print(f'{self.name} says: Yap yap yap!')\n",
    "        \n",
    "    def wagTail(self):\n",
    "        print('Vigorous wagging!')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "2638478c",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Roxy says: Yap yap yap!\n",
      "Vigorous wagging!\n"
     ]
    }
   ],
   "source": [
    "dog = Chihuahua('Roxy')\n",
    "dog.speak()\n",
    "dog.wagTail()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "id": "4c8ffee3",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Rover says: Bark!\n"
     ]
    }
   ],
   "source": [
    "myDog = Dog('Rover')\n",
    "myDog.speak()"
   ]
  },
  {
   "attachments": {},
   "cell_type": "markdown",
   "id": "055ba278",
   "metadata": {},
   "source": [
    "### Extending built-in classes"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "e9e6201a",
   "metadata": {},
   "outputs": [],
   "source": [
    "myList = list()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "id": "a740b104",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[1, 2]\n"
     ]
    }
   ],
   "source": [
    "class UniqueList(list):\n",
    "    def append(self, item):\n",
    "        if item in self:\n",
    "            return\n",
    "        super().append(item)\n",
    "        \n",
    "uniqueList = UniqueList()\n",
    "uniqueList.append(1)\n",
    "uniqueList.append(1)\n",
    "uniqueList.append(2)\n",
    "\n",
    "print(uniqueList)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "id": "c3e49b7e",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Unique List!\n"
     ]
    }
   ],
   "source": [
    "class UniqueList(list):\n",
    "    \n",
    "    def __init__(self):\n",
    "        super().__init__()\n",
    "        self.someProperty = 'Unique List!'\n",
    "        \n",
    "\n",
    "    def append(self, item):\n",
    "        if item in self:\n",
    "            return\n",
    "        super().append(item)\n",
    "        \n",
    "uniqueList = UniqueList()\n",
    "uniqueList.append(1)\n",
    "uniqueList.append(1)\n",
    "uniqueList.append(2)\n",
    "\n",
    "print(uniqueList.someProperty)"
   ]
  }
 ],
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