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11 lines
283 B
Python
11 lines
283 B
Python
class SingletonMeta(type):
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"""
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一个用于创建单例的元类
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"""
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_instances = {}
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def __call__(cls, *args, **kwargs):
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if cls not in cls._instances:
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cls._instances[cls] = super().__call__(*args, **kwargs)
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return cls._instances[cls]
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