code: def clip(self, lower=None, upper=None):
      '''
      Trim values at input thresholds using pandas function
      '''
      df = self.export_df()
      df = df.clip(lower=lower, upper=upper)
      self.load_df(dff clip(self, lower=None, upper=None):
      '''
      Trim values at input thresholds using pandas function
      '''
      df = self.export_df()
      df = df.clip(lower=lower, upper=upper)
      self.load_df(df)
docs: Trim values at input thresholds using pandas function