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3
À<×eO  ã               @   s   G d d„ de ƒZdS )c               @   s(   e Zd ZdZdZdd„ Zedd„ ƒZdS )Ú	Singletonz
	Singleton design pattern.
	Nc             C   s   | j tkrtdƒ‚d S )NzCannot instantiate directly.)Ú	__class__r   Ú	TypeError)Úself© r   ú/usr/lib/python3.6/patterns.pyÚ__init__   s    
zSingleton.__init__c             C   s   | j dkr| ƒ | _ | j S )zGet the class instance.N)Ú	_instance)Úclsr   r   r   Úget_instance   s    
zSingleton.get_instance)Ú__name__Ú
__module__Ú__qualname__Ú__doc__r   r   Úclassmethodr
   r   r   r   r   r      s   r   N)Úobjectr   r   r   r   r   Ú<module>   s    