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8-liner: Setup city_name after instantiating for the first time solution in Clear category for Capital City by Stensen
class Capital:
__instance = None
def __new__(cls, city_name: str):
if cls.__instance is None:
cls.__instance = object.__new__(cls)
cls.__instance.city_name = city_name
return cls.__instance
name = lambda cls: cls.__instance.city_name
Oct. 14, 2020