fix mypy issue introduced in #1304

pylib/anki/exporting.py

@@ -10,7 +10,7 @@ import shutil
 import unicodedata
 import zipfile
 from io import BufferedWriter
-from typing import Any, Dict, List, Optional, Tuple, Union
+from typing import Any, Dict, List, Optional, Sequence, Tuple, Union
 from zipfile import ZipFile
 
 from anki import hooks
@@ -210,7 +210,7 @@ class AnkiExporter(Exporter):
         cids = self.cardIds()
         # copy cards, noting used nids
         nids = {}
-        data = []
+        data: List[Sequence] = []
         for row in self.src.db.execute(
             "select * from cards where id in " + ids2str(cids)
         ):