code: def neurons(self):
          
          self.cursor.execute('SELECT DISTINCT neuron FROM spikes ORDER BY neuron')
          sel = self.cursor.fetchall()
          return np.array(sel).flatten()
docs: Return list of neuron indices.
  
  
          Parameters
          ----------
          None
          
  
          Returns
          -------
          list
              list of neuron indices
          
          
          See also
          --------
          sqlite3.connect.cursor