class mytype(type):
    @staticmethod
    def __new__(meta, name, bases, __dict__):
        print('Creating class :', name)
        print('Base classes   :', bases)
        print('Attributes     :', list(__dict__))
        return super().__new__(meta, name, bases, __dict__)


class myobject(metaclass=mytype):
    pass


class Stock(myobject):
    def __init__(self, name, shares, price):
        self.name = name
        self.shares = shares
        self.price = price

    def cost(self):
        return self.shares * self.price

    def sell(self, nshares):
        self.shares -= nshares