diff --git a/executorlib/interactive/executor.py b/executorlib/interactive/executor.py
index 568982bc..1f532f79 100644
--- a/executorlib/interactive/executor.py
+++ b/executorlib/interactive/executor.py
@@ -29,8 +29,7 @@
 from executorlib.standalone.thread import RaisingThread
 
 try:  # The PyFluxExecutor requires flux-base to be installed.
-    from executorlib.interactive.flux import FluxPythonSpawner
-    from executorlib.interactive.flux import validate_max_workers
+    from executorlib.interactive.flux import FluxPythonSpawner, validate_max_workers
 except ImportError:
     pass
 
diff --git a/executorlib/interactive/flux.py b/executorlib/interactive/flux.py
index 04f25a5c..fd674087 100644
--- a/executorlib/interactive/flux.py
+++ b/executorlib/interactive/flux.py
@@ -12,7 +12,12 @@ def validate_max_workers(max_workers, cores, threads_per_core):
     cores_total = flux.resource.list.resource_list(handle).get().up.ncores
     cores_requested = max_workers * cores * threads_per_core
     if cores_total < cores_requested:
-        raise ValueError("The number of requested cores is larger than the available cores " + str(cores_total) + " < " + str(cores_requested))
+        raise ValueError(
+            "The number of requested cores is larger than the available cores "
+            + str(cores_total)
+            + " < "
+            + str(cores_requested)
+        )
 
 
 class FluxPythonSpawner(BaseSpawner):