docstr: A proxy-call to the dataframe's `.to_markdown()`.
code: def to_markdown(self):
      """
      A proxy-call to the dataframe's `.to_markdown()`.
      """
      return self.dataframe.to_markdown()
  
imports: from abc import ABC
label_desc: Use image node_id 50 for calling the DataframeAbstract obj's underlying member method code with example usage: obj.to_markdown() and returns: self