code: def drop(self,arg):
          
          df = super(Ensemble,self).drop(arg)
          return type(self)(data=df,pst=self.pst)
docs: overload of pandas.DataFrame.drop()
  
          Parameters
          ----------
          arg : iterable
              argument to pass to pandas.DataFrame.drop()
  
          Returns
          -------
          Ensemble : Ensemble