
­­­­­­­­­­­­­­­­­­
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3
<eO                 @   s   G d d de ZdS )c               @   s(   e Zd ZdZdZdd Zedd ZdS )	Singletonz
	Singleton design pattern.
	Nc             C   s   | j tkrtdd S )NzCannot instantiate directly.)	__class__r   	TypeError)self r   /usr/lib/python3.6/patterns.py__init__   s    
zSingleton.__init__c             C   s   | j dkr|  | _ | j S )zGet the class instance.N)	_instance)clsr   r   r   get_instance   s    
zSingleton.get_instance)__name__
__module____qualname____doc__r   r   classmethodr
   r   r   r   r   r      s   r   N)objectr   r   r   r   r   <module>   s    