docstr: A proxy-call to the dataframe's `.fillna()`.
code: def fillna(self, value):
      """
      A proxy-call to the dataframe's `.fillna()`.
      """
      return self.dataframe.fillna(value=value)
  
imports: from abc import ABC
label_desc: Use image node_id 14 for calling the DataframeAbstract obj's underlying member method code with example usage: obj.fillna(value) and returns: self