docstr: A proxy-call to the dataframe's `.std()`.
code: def std(self):
      """
      A proxy-call to the dataframe's `.std()`.
      """
      return self.dataframe.std()
  
imports: from abc import ABC
label_desc: Use image node_id 30 for calling the DataframeAbstract obj's underlying member method code with example usage: obj.std() and returns: self