django - python observer pattern -

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I'm new to python, but I've gone into a heart trying to apply the variation of the supervisor pattern. / P> 

  class X (models.model): a = model It is not said that X is defined . Some things are possible:  
 A) There is a way of referring to the current class (examples, but class objects).  
 B) You can not even run the code outside of a method (I thought it could work almost like a static manufacturer - it will only run once).  
  
 
 
 There is nothing wrong with the code (limited) in class definition:  
  class X (object): print ("Loading X")  
 
 However, you can not reference x because it is not yet fully defined is.

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