inheritence-python.py

class Decimal:
    def __init__(self, number, places):
        self.number = number
        self.places = places

    def __repr__(self):
        return "%.{}f".format(self.places) % self.number


class Currency(Decimal):
    def __init__(self, symbol, number, places):
        super().__init__(number, places)
        self.symbol = symbol

    def __repr__(self):
        return "{}{}".format(self.symbol, super().__repr__())


dec = Decimal(15.682112, 4)
curr = Currency('£', 17.8911, 2)
print(dec)
print(curr)