item_instance_method.py

class Item:
  
    def __init__(self, item_name, price):
        self.item_name = item_name
        self.price = price
    
    # this is an instance method taking in no arguments
    def buy_item(self):
        print(f'{self.item_name.title()} is being bought for ${self.price}')
        
    # instance method taking 1 argument
    def increase_price(self, new_price):
        print(f'{self.item_name.title()} price is increased to ${new_price} from ${self.price}')
        self.price = new_price

burger = Item(item_name='burger', price=2.55)
burger.increase_price(3.50)
burger.buy_item()