diff --git a/src/diagnosers/50-systemresources.py b/src/diagnosers/50-systemresources.py
index 1096daebf..6ac7f0ec4 100644
--- a/src/diagnosers/50-systemresources.py
+++ b/src/diagnosers/50-systemresources.py
@@ -18,7 +18,7 @@ class MyDiagnoser(Diagnoser):
 
     def run(self):
 
-        MB = 1024 ** 2
+        MB = 1024**2
         GB = MB * 1024
 
         #
diff --git a/src/migrations/0021_migrate_to_bullseye.py b/src/migrations/0021_migrate_to_bullseye.py
index f4361cb19..551a6f64b 100644
--- a/src/migrations/0021_migrate_to_bullseye.py
+++ b/src/migrations/0021_migrate_to_bullseye.py
@@ -293,7 +293,7 @@ class MyMigration(Migration):
             raise YunohostError("migration_0021_not_buster")
 
         # Have > 1 Go free space on /var/ ?
-        if free_space_in_directory("/var/") / (1024 ** 3) < 1.0:
+        if free_space_in_directory("/var/") / (1024**3) < 1.0:
             raise YunohostError("migration_0021_not_enough_free_space")
 
         # Check system is up to date
diff --git a/src/tools.py b/src/tools.py
index f85d0abdf..45163135f 100644
--- a/src/tools.py
+++ b/src/tools.py
@@ -226,7 +226,7 @@ def tools_postinstall(
     main_space = sum(
         psutil.disk_usage(d.mountpoint).total for d in main_disk_partitions
     )
-    GB = 1024 ** 3
+    GB = 1024**3
     if not force_diskspace and main_space < 10 * GB:
         raise YunohostValidationError("postinstall_low_rootfsspace")
 
diff --git a/src/utils/config.py b/src/utils/config.py
index 0b2aca414..b8ea93589 100644
--- a/src/utils/config.py
+++ b/src/utils/config.py
@@ -1144,7 +1144,11 @@ class AppQuestion(Question):
         apps = app_list(full=True)["apps"]
 
         if self.filter:
-            apps = [app for app in apps if evaluate_simple_js_expression(self.filter, context=app)]
+            apps = [
+                app
+                for app in apps
+                if evaluate_simple_js_expression(self.filter, context=app)
+            ]
 
         def _app_display(app):
             domain_path_or_id = f" ({app.get('domain_path', app['id'])})"