human
Solve the following python programming problem given the following code:
def compile(self) : 
    child_scheme = self.input.scheme () 
    self.language.currentop = self.input 
    def formatemitter(name, exp) : 
        e = self.language.compile_expression (exp) 
        if isinstance (exp, AttributeRef) : 
            return ('%s' % e) 
else : 
            return ('%s as ?%s' % (e, name)) 
emitters = ', '.join ([formatemitter (name, exp) for (name, exp) in emitters.emitters]) 
    return ('
  SELECT %s
  {
   %s
  }
  ' % (emitters, self.input.compile ())) 

    
    

    Fix the buggy line: emitters = ', '.join ([formatemitter (name, exp) for (name, exp) in emitters.emitters])
assistant
#Here is Python program to fix the buggy line: emitters = ', '.

emitters = ', '.join ([formatemitter (name, exp) for (name, exp) in self.emitters])