diff --git a/problem/views/admin.py b/problem/views/admin.py
index af66dc3d..280e4fa1 100644
--- a/problem/views/admin.py
+++ b/problem/views/admin.py
@@ -1,7 +1,7 @@
 import hashlib
 import json
 import os
-import shutil
+# import shutil
 import tempfile
 import zipfile
 from wsgiref.util import FileWrapper
@@ -676,10 +676,10 @@ class FPSProblemImport(CSRFExemptAPIView):
             with tempfile.NamedTemporaryFile("wb") as tf:
                 for chunk in file.chunks(4096):
                     tf.file.write(chunk)
-                
+
                 tf.file.flush()
                 os.fsync(tf.file)
-                
+
                 problems = FPSParser(tf.name).parse()
         else:
             return self.error("Parse upload file error")
diff --git a/problem/views/oj.py b/problem/views/oj.py
index 3d3c4435..534fa605 100644
--- a/problem/views/oj.py
+++ b/problem/views/oj.py
@@ -10,7 +10,7 @@ from contest.models import ContestRuleType
 class ProblemTagAPI(APIView):
     def get(self, request):
         qs = ProblemTag.objects
-        keyword = request.GET.get('keyword')
+        keyword = request.GET.get("keyword")
         if keyword:
             qs = ProblemTag.objects.filter(name__icontains=keyword)
         tags = qs.annotate(problem_count=Count("problem")).filter(problem_count__gt=0)
diff --git a/utils/constants.py b/utils/constants.py
index ac0c97b6..749b20da 100644
--- a/utils/constants.py
+++ b/utils/constants.py
@@ -33,4 +33,4 @@ class Difficulty(Choices):
     HIGH = "High"
 
 
-CONTEST_PASSWORD_SESSION_KEY = "contest_password"
\ No newline at end of file
+CONTEST_PASSWORD_SESSION_KEY = "contest_password"