在检查字面量集合的成员资格时使用 set

Co-authored-by: sourcery-ai[bot] <58596630+sourcery-ai[bot]@users.noreply.github.com>

astrbot/core/knowledge_base/parsers/util.py

@@ -2,7 +2,7 @@ from .base import BaseParser
 
 
 async def select_parser(ext: str) -> BaseParser:
-    if ext in [".md", ".txt", ".markdown", ".xlsx", ".docx", ".xls"]:
+    if ext in {".md", ".txt", ".markdown", ".xlsx", ".docx", ".xls"}:
         from .markitdown_parser import MarkitdownParser
 
         return MarkitdownParser()