django - SQLAlchemy EXISTS queryset -

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I only use the Django Framework with my ORM

And there is some code: 

  User.objects.filter (user name = 'test'). Is present ()   
 This is true or false.  
 This orm query generated SQL:  
  "auth_user" WHERE "auth_user" as "SELECT (1)" "User Name" = E'test 'LIMIT 1   
  
 Please help.  
 Thank you!  
 I try to understand this page. / P>  
 
 
 (ret,), = session.key (exists). Where (user.username == 'test'))

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