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Singleton Design in Python

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Error(s), warning(s):
Traceback (most recent call last):
  File "source_file.py", line 16, in <module>
    r = Singleton()
  File "source_file.py", line 12, in __init__
    raise Exception("This is a singleton class:")
Exception: This is a singleton class:


        

    
                		
                
                    

                          
                                
                                
                        
                         



                        
                        
                        

                        

                        
                        

                          
                                
                                
                                  

                                    
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