Use double quotes

.flake8

.pre-commit-config.yaml

arkindex/documents/admin.py

arkindex/documents/api/elements.py

arkindex/documents/api/entities.py

arkindex/documents/api/export.py

arkindex/documents/api/iiif.py

arkindex/documents/api/ml.py

arkindex/documents/api/search.py

arkindex/documents/apps.py

arkindex/documents/date_parser.py

arkindex/documents/dates.py

arkindex/documents/deletion.py

arkindex/documents/export/__init__.py

arkindex/documents/indexer.py

arkindex/documents/management/commands/bootstrap.py

arkindex/documents/management/commands/build_fixtures.py

arkindex/documents/management/commands/cleanup.py

arkindex/documents/management/commands/delete.py

arkindex/documents/management/commands/load_export.py