old_contents: # flake8: NOQA
  from .election import Election, ElectionIdentifier, ElectionSource
  from .candidacy import Candidacy, CandidacySource
  from .contests.base import ContestBase
  from .contests.ballot_measure import (BallotMeasureContest, BallotMeasureContestOption,
                                        BallotMeasureContestIdentifier, 
                                        BallotMeasureContestSource,
                                        RetentionContest, RetentionContestIdentifier, 
                                        RetentionContestSource)
  from .contests.candidate import (CandidateContest, CandidateContestPost,
                                   CandidateContestIdentifier, CandidateContestSource)
  from .contests.party import (PartyContest, PartyContestOption, 
                               PartyContestIdentifier, PartyContestSource)
  
new_contents: # flake8: NOQA
  from .election import Election, ElectionIdentifier, ElectionSource
  from .candidacy import Candidacy, CandidacySource
  from .contests.base import ContestBase
  from .contests.ballot_measure import (BallotMeasureContest, BallotMeasureContestOption,
                                        BallotMeasureContestIdentifier,
                                        BallotMeasureContestSource,
                                        RetentionContest, RetentionContestOption,
                                        RetentionContestIdentifier,
                                        RetentionContestSource)
  from .contests.candidate import (CandidateContest, CandidateContestPost,
                                   CandidateContestIdentifier, CandidateContestSource)
  from .contests.party import (PartyContest, PartyContestOption,
                               PartyContestIdentifier, PartyContestSource)
  
subject: Add import of RetentionContestOption