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First solution in Clear category for Capital City by tom-tom
class CapitalMeta(type):
_instance = None
def __call__(cls, *args, **kwargs):
if cls._instance is None:
cls._instance = super(CapitalMeta, cls).__call__(*args, **kwargs)
return cls._instance
class Capital(metaclass=CapitalMeta):
def __init__(self, city_name):
self._name = city_name
def name(self):
return self._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!")
June 22, 2018
