code: def norm(self, db_level=-3.0):
          '''Normalize an audio file to a particular db level.
          This behaves identically to the gain effect with normalize=True.
  
          Parameters
          ----------
          db_level : float, default=-3.0
              Output volume (db)
  
          See Also
          --------
          gain, loudness
  
          '''
          if not is_number(db_level):
              raise ValueError('db_level must be a number.')
  
          effect_args = [
              'norm',
              '{:f}'.format(db_level)
          ]
          self.effects.extend(effect_args)
          self.effects_log.append('norm')
  
          return self norm(self, db_level=-3.0):
          '''Normalize an audio file to a particular db level.
          This behaves identically to the gain effect with normalize=True.
  
          Parameters
          ----------
          db_level : float, default=-3.0
              Output volume (db)
  
          See Also
          --------
          gain, loudness
  
          '''
          if not is_number(db_level):
              raise ValueError('db_level must be a number.')
  
          effect_args = [
              'norm',
              '{:f}'.format(db_level)
          ]
          self.effects.extend(effect_args)
          self.effects_log.append('norm')
  
          return self
docs: Normalize an audio file to a particular db level.
          This behaves identically to the gain effect with normalize=True.
  
          Parameters
          ----------
          db_level : float, default=-3.0
              Output volume (db)
  
          See Also
          --------
          gain, loudness