docs: def record(self, pipeline_name, from_study):
          """
          Returns the provenance record for a given pipeline
  
          Parameters
          ----------
          pipeline_name : str
              The name of the pipeline that generated the record
          from_study : str
              The name of the study that the pipeline was generated from
  
          Returns
          -------
          record : arcana.provenance.Record
              The provenance record generated by the specified pipeline
          """
          try:
              return self._records[(pipeline_name, from_study)]
          except KeyError:
              found = []
              for sname, pnames in groupby(sorted(self._records,
                                                  key=itemgetter(1)),
                                           key=itemgetter(1)):
                  found.append(
                      "'{}' for '{}'".format("', '".join(p for p, _ in pnames),
                                             sname))
              raise ArcanaNameError(
                  (pipeline_name, from_study),
                  ("{} doesn't have a provenance record for pipeline '{}' "
                   "for '{}' study (found {})".format(
                       self, pipeline_name, from_study,
                       '; '.join(found))))