diff --git a/bemani/backend/ddr/ddrsn2.py b/bemani/backend/ddr/ddrsn2.py
index c01891c..c5e4a10 100644
--- a/bemani/backend/ddr/ddrsn2.py
+++ b/bemani/backend/ddr/ddrsn2.py
@@ -6,28 +6,12 @@ import logging
 import math
 
 from enum import IntEnum
-from typing import Dict, Optional, Tuple
+from typing import Optional
 from typing_extensions import Final
-from ctypes import *
+from ctypes import Structure, c_int8, c_int16, c_uint8, c_uint16, c_uint32, c_char
 
 from bemani.backend.ddr.base import DDRBase
 from bemani.backend.ddr.stubs import DDRSuperNova
-from bemani.backend.ddr.common import (
-    DDRGameFriendHandler,
-    DDRGameLockHandler,
-    DDRGameLoadCourseHandler,
-    DDRGameLoadHandler,
-    DDRGameLogHandler,
-    DDRGameMessageHandler,
-    DDRGameNewHandler,
-    DDRGameOldHandler,
-    DDRGameRankingHandler,
-    DDRGameSaveCourseHandler,
-    DDRGameSaveHandler,
-    DDRGameScoreHandler,
-    DDRGameShopHandler,
-    DDRGameTraceHandler,
-)
 from bemani.common import VersionConstants, Profile, PlayStatistics, DBConstants, intish, Time
 from bemani.data import Score, UserID
 from bemani.protocol import Node
@@ -655,7 +639,7 @@ class DDRSuperNova2(
                 perf = intish(child.attribute("perf"))
                 rank = intish(child.attribute("rank"))
                 score = intish(child.attribute("score"))
-            except:
+            except ValueError:
                 continue
 
             self.update_score(
diff --git a/bemani/client/ddr/ddrsn2.py b/bemani/client/ddr/ddrsn2.py
index 6827880..968fc06 100644
--- a/bemani/client/ddr/ddrsn2.py
+++ b/bemani/client/ddr/ddrsn2.py
@@ -316,7 +316,7 @@ class DDRSN2Client(BaseClient):
             # Verify empty profile
             (player_info, scores1, scores2) = self.verify_player_get(ref_id)
             if player_info is None:
-                raise Exception(f"Player info should not be None")
+                raise Exception("Player info should not be None")
             if player_info.name.decode("euc-jp").strip() != self.NAME:
                 raise Exception(f"Player info name should be {self.NAME} not {player_info.name}")
             if player_info.count != 0:
@@ -363,7 +363,7 @@ class DDRSN2Client(BaseClient):
 
             (player_info, scores1, scores2) = self.verify_player_get(ref_id)
             if player_info is None:
-                raise Exception(f"Player info should not be None")
+                raise Exception("Player info should not be None")
             if player_info.name.decode("euc-jp").strip() != self.NAME:
                 raise Exception(f"Player info name should be {self.NAME} not {player_info.name}")
             if player_info.count != 1: