code: def df(self, version=None, tags=None, ext=None, **kwargs):
          
          ext = self._find_extension(version=version, tags=tags)
          if ext is None:
              attribs = "{}{}".format(
                  "version={} and ".format(version) if version else "",
                  "tags={}".format(tags) if tags else "",
              )
              raise MissingDatasetError(
                  "No dataset with {} in local store!".format(attribs))
          fpath = self.fpath(version=version, tags=tags, ext=ext)
          fmt = SerializationFormat.by_name(ext)
          return fmt.deserialize(fpath, **kwargs)
docs: Loads an instance of this dataset into a dataframe.
  
          Parameters
          ----------
          version: str, optional
              The version of the instance of this dataset.
          tags : list of str, optional
              The tags associated with the desired instance of this dataset.
          ext : str, optional
              The file extension to use. If not given, the default extension is
              used.
          **kwargs : extra keyword arguments, optional
              Extra keyword arguments are forwarded to the deserialization method
              of the SerializationFormat object corresponding to the extension
              used.
  
          Returns
          -------
          pandas.DataFrame
              A dataframe containing the desired instance of this dataset.