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metaclass solution in Clear category for Capital City by Sim0000
class Singleton(type):
_instance = {}
def __call__(cls, *args, **kwargs):
if cls not in cls._instance:
cls._instance[cls] = super(Singleton, cls).__call__(*args, **kwargs)
return cls._instance[cls]
class Capital(metaclass=Singleton):
def __init__(self, city_name):
self.city_name = city_name
def name(self):
return self.city_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"
print("Coding complete? Let's try tests!")
June 11, 2018
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