docstr: A proxy-call to the dataframe's `.dropna()`.
code: def dropna(self, axis):
      """
      A proxy-call to the dataframe's `.dropna()`.
      """
      return self.dataframe.dropna(axis=axis)
  
imports: from abc import ABC
label_desc: Use image node_id 13 for calling the DataframeAbstract obj's underlying member method code with example usage: obj.dropna(axis) and returns: self