Week5.ipynb

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   "source": [
    "# Classes and Methods"
   ]
  },
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   "metadata": {},
   "source": [
    "***Instance Methods***\n",
    "\n",
    "**Problem** OK, now it’s your turn! Have a go at writing methods for a class. Create a Dog class with dog_years based on the Piglet class shown before (one human year is about 7 dog years)."
   ]
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     "text": [
      "21\n"
     ]
    }
   ],
   "source": [
    "class Dog:\n",
    "  years = 0\n",
    "  def dog_years(self):\n",
    "    return self.years*7\n",
    "    \n",
    "fido=Dog()\n",
    "fido.years=3\n",
    "print(fido.dog_years())"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "***Constructors and Other Special Methods***\n",
    "\n",
    "***Problem*** In this code, there's a Person class that has an attribute name, which gets set when constructing the object. Fill in the blanks so that 1) when an instance of the class is created, the attribute gets set correctly, and 2) when the greeting() method is called, the greeting states the assigned name.\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
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     "name": "stdout",
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     "text": [
      "hi, my name is Foysal\n"
     ]
    }
   ],
   "source": [
    "class Person:\n",
    "    def __init__(self, name):\n",
    "        self.name = name\n",
    "    def greeting(self):\n",
    "        # Should return \"hi, my name is \" followed by the name of the Person.\n",
    "        return \"hi, my name is {}\".format(self.name)\n",
    "\n",
    "# Create a new instance with a name of your choice\n",
    "some_person = Person(\"Foysal\")  \n",
    "# Call the greeting method\n",
    "print(some_person.greeting())"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "***Inheritance***\n",
    "\n",
    "***Problem***: Let’s create a new class together and inherit from it. Below we have a base class called Clothing. Together, let’s create a second class, called Shirt, that inherits methods from the Clothing class. Fill in the blanks to make it work properly."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "This Polo is made of Cotton\n"
     ]
    }
   ],
   "source": [
    "class Clothing:\n",
    "  material = \"\"\n",
    "  def __init__(self,name):\n",
    "    self.name = name\n",
    "  def checkmaterial(self):\n",
    "\t  print(\"This {} is made of {}\".format(self.name,self.material))\n",
    "\t\t\t\n",
    "class Shirt(Clothing):\n",
    "  material=\"Cotton\"\n",
    "\n",
    "polo = Shirt(\"Polo\")\n",
    "polo.checkmaterial()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "***Composition***\n",
    "\n",
    "***Problem***:  Your mission: Finish the \"Stock_by_Material\" method and iterate over the amount of each item of a given material that is in stock. When you’re finished, the script should add up to 10 cotton Polo shirts.\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "10\n"
     ]
    }
   ],
   "source": [
    "class Clothing:\n",
    "  stock={ 'name': [],'material' :[], 'amount':[]}\n",
    "  def __init__(self,name):\n",
    "    material = \"\"\n",
    "    self.name = name\n",
    "  def add_item(self, name, material, amount):\n",
    "    Clothing.stock['name'].append(self.name)\n",
    "    Clothing.stock['material'].append(self.material)\n",
    "    Clothing.stock['amount'].append(amount)\n",
    "  def Stock_by_Material(self, material):\n",
    "    count=0\n",
    "    n=0\n",
    "    for item in Clothing.stock['material']:\n",
    "      if item == material:\n",
    "        count += Clothing.stock['amount'][n]\n",
    "        n+=1\n",
    "    return count\n",
    "\n",
    "class shirt(Clothing):\n",
    "  material=\"Cotton\"\n",
    "class pants(Clothing):\n",
    "  material=\"Cotton\"\n",
    "  \n",
    "polo = shirt(\"Polo\")\n",
    "sweatpants = pants(\"Sweatpants\")\n",
    "polo.add_item(polo.name, polo.material, 4)\n",
    "sweatpants.add_item(sweatpants.name, sweatpants.material, 6)\n",
    "current_stock = polo.Stock_by_Material(\"Cotton\")\n",
    "print(current_stock)"
   ]
  }
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