item_class_method.py

class Item:
    # this is a class variable
    percent_off = 0.1

    def __init__(self, item_name, price):
        self.item_name = item_name
        self.price = price
    
    # a class method taking in 1 argument
    @classmethod
    def raise_percent_off(cls, new_percent_off):
        cls.percent_off = new_percent_off
        
burger = Item(item_name='burger', price=2.55)

# print out the percent_off
print('Orignal Percentage Off:', burger.percent_off)

# Item.raise_percent_off(0.3)
# 0R
burger.raise_percent_off(0.3)

# print out the percent_off after the altering
print('Edited Percentage Off:', burger.percent_off)