class Capital:
    class __Singleton:
        def __init__(self, city_name):
            self.val = None
            self.city_name = city_name

        def __str__(self):
            return repr(self) + self.val

        def name(self):
            return self.city_name

    instance = None

    def __new__(cls, city_name):  # _new_ est toujours une méthode de classe
        if not Capital.instance:
            Capital.instance = Capital.__Singleton(city_name)
        return Capital.instance

    def __getattr__(self, attr):
        return getattr(self.instance, attr)

    def __setattr__(self, attr, val):
        return setattr(self.instance, attr, val)

    @staticmethod
    def name():
        return Capital.instance.name()


if __name__ == '__main__':
    # These "asserts" using only for self-checking and not necessary for auto-testing

    ukraine_capital_1 = Capital("Kyiv")
    ukraine_capital_2 = Capital("London")
    ukraine_capital_3 = Capital("Marocco")

    assert ukraine_capital_2.name() == "Kyiv"
    assert ukraine_capital_3.name() == "Kyiv"

    assert ukraine_capital_2 is ukraine_capital_1
    assert ukraine_capital_3 is ukraine_capital_1

    print("Coding complete? Let's try tests!")