ItsDrike

"""
This attempts to abstarct away the standard way of using `__init__`,
the problem it tries to solve is the repetetiveness of using init purely
to store it's parameters into the instance under the exactly same name, i.e.:
class Stock:
    def __init__(name, shares, price):
        self.name = name
        self.shares = shares
        self.price = price
"""

ItsDrike

class ClassicalItem:
    """
    The classical solution, there's nothing special about it,
    but if we came from old implementation without this protection,
    we would loose backwards compatibility, because `amount` attribute
    wouldn't be accessible anymore.
    """
    def __init__(self, description, amount, price):
        self.description = description
        self.set_amount(amount)