Untitled

class Shop(object):
    # discount amount
    # it will be subtract from the MRP of the product
    DISCOUNT_AMOUNT = 2500

    def __init__(self):
        # products
        # name of the product and the price of the product
        self.products = {
            "hp": 49999,
            "lenovo": 56999,
            "acer": 44999
        }
        self.TOTAL_PRODUCTS = len(self.products.keys())
    

    def get_product_by_index(self, index: int):
        """
        Returns product name and price in tuple by index entered by user
        """
        index = index-1
        PRODUCT_NAME = list(self.products.keys())[index]
        PRODUCT_PRICE = self.products[list(self.products.keys())[index]]
        return (PRODUCT_NAME, PRODUCT_PRICE)


    def start(self):
        """
        start the shop
        """
        i = 1
        for k,v in self.products.items():
            print("Product index:",i)
            print("Product name:",k)
            print("Product price:",v)
            print("-"*25)
            i += 1
        
        index = None
        while not index or not index.isnumeric() or int(index) < 1 or int(index) > self.TOTAL_PRODUCTS:
            index = input("Enter product index:")

        PRODUCT_NAME, PRODUCT_PRICE = self.get_product_by_index(int(index))
        print("You've purchased %s, for %.2f" %(PRODUCT_NAME, PRODUCT_PRICE-self.DISCOUNT_AMOUNT))


if __name__ == "__main__":
    shop = Shop()
    shop.start()