Fix list parameter default.

diff --git a/lib/sqlalchemy/sql/ddl.py b/lib/sqlalchemy/sql/ddl.py
index 233e79f7c5012fcd3aedf3e06626e05ea67951b3..f8985548ee04896a02c13615e430bb28994d6c6f 100644 (file)
--- a/lib/sqlalchemy/sql/ddl.py
+++ b/lib/sqlalchemy/sql/ddl.py
@@ -1081,7 +1081,7 @@ class SchemaDropper(DDLBase):
         table,
         drop_ok=False,
         _is_metadata_operation=False,
-        _ignore_sequences=[],
+        _ignore_sequences=(),
     ):
         if not drop_ok and not self._can_drop_table(table):
             return