Unbound variable in python -

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I'm trying to create a toy singleton in Python for learning the language and simultaneously running into a problem. I am declaring such a class. 

  class error logger: #include which provides logging in file instance = a df getInstance (): # Our singleton " Constructor "for example no one is: print" foo "  
 when I  
  file "/ home / pal / call    Projects / Space / SRC / Error Laggar ", line 7, if there is no example in getInstance: unbound local error: local variable 'example' referenced before assignment   
 what's happening here , Should be assigned statically as an example? What would be the right way to do this?   
 
 
 This is a static variable in the form of the  ErrorLogger  prefix.   Class error: Homeless: # Singleton which provides a file instance = any logging @staticmethod def getInstance (): # If our singleton "constructor" error logger .instance is none: print "foo"

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