From c2bc52718a15e7e4ed647b812301beee1bec0a63 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sybren=20A=2E=20St=C3=BCvel?= <sybren@stuvel.eu>
Date: Tue, 6 Jun 2017 17:35:30 +0200
Subject: [PATCH] Fixed string formatting in exception raising

---
 pillar/api/users/__init__.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pillar/api/users/__init__.py b/pillar/api/users/__init__.py
index d08078a7..369081fd 100644
--- a/pillar/api/users/__init__.py
+++ b/pillar/api/users/__init__.py
@@ -50,8 +50,8 @@ def user_group_action(user_id: bson.ObjectId, group_id: bson.ObjectId, action: s
     )
 
     if result.matched_count == 0:
-        raise ValueError('Unable to %s user %s membership of group %s; user not found.',
-                         action, user_id, group_id)
+        raise ValueError(f'Unable to {action} user {user_id} membership of group {group_id}; '
+                         f'user not found.')
 
 
 def setup_app(app, api_prefix):