fix: missing format arg

2018-08-11 07:35:39 +02:00
parent ba08931020
commit c5aeab37b7
1 changed files with 3 additions and 1 deletions
--- a/bonobo/config/services.py
+++ b/bonobo/config/services.py
@ -68,7 +68,9 @@ class Container(dict):
        if len(args) == 1:
            if len(kwargs):
                raise ValueError(
-                    'You can either use {} with one positional argument or with keyword arguments, not both.'
+                    'You can either use {} with one positional argument or with keyword arguments, not both.'.format(
+                        cls.__name__
+                    )
                )
            if not args[0]:
                return super().__new__(cls)