Method __init__

Solutions/4_2/validate.py:55–58

(self, name, shares, price)

    class Stock:
        __slots__ = ('name','_shares','_price')
        def __init__(self, name, shares, price):
            self.name = name
            self.shares = shares
            self.price = price

        def __repr__(self):
            return f'Stock({self.name!r}, {self.shares!r}, {self.price!r})'