def singleton(cls):
    instances = {}

    def get_instance(*args, **kwargs):
        if cls not in instances:
            instances[cls] = cls(*args, **kwargs)
        return instances[cls]
    return get_instance


# 示例使用
# @singleton
# class Singleton:
#     def __init__(self, value):
#         self.value = value


# singleton1 = Singleton(1)
# singleton2 = Singleton(2)

# print(singleton1.value)  # 输出: 1
# print(singleton2.value)  # 输出: 1
# print(singleton1 is singleton2)  # 输出: True