diff --git a/snakemake_interface_common/exceptions.py b/snakemake_interface_common/exceptions.py
index 4485ae1..8ab6b18 100644
--- a/snakemake_interface_common/exceptions.py
+++ b/snakemake_interface_common/exceptions.py
@@ -28,7 +28,9 @@ def format_arg(self, arg):
             return "{}{}:\n{}".format(
                 arg.__class__.__name__, spec, textwrap.indent(str(arg), "    ")
             )
-        elif sys.version_info >= (3, 11) and isinstance(arg, ExceptionGroup): # noqa: F821
+        elif sys.version_info >= (3, 11) and isinstance(
+            arg, ExceptionGroup
+        ):  # noqa: F821
             return "\n".join(self.format_arg(exc) for exc in arg.exceptions)
         else:
             return f"{arg.__class__.__name__}: {arg}"