diff --git a/src/exdf/data_reduction/method.py b/src/exdf/data_reduction/method.py
index f2eaeff47bcba6ea8d58d8318f1fe9fe0358625e..d106ed4c56b16f21728e69439269e26ec2a4d5e7 100644
--- a/src/exdf/data_reduction/method.py
+++ b/src/exdf/data_reduction/method.py
@@ -23,7 +23,6 @@ def is_train_selection(x):
 
 
 def is_index_expression(x):
-    print(x, type(x))
     if isinstance(x, (slice, list)):
         return True
 
diff --git a/src/exdf/write/sd_writer.py b/src/exdf/write/sd_writer.py
index 921092f0278c0613e005d2da13bdf6d8e24c1c5b..1f7b3bcf8ac60b3f5660e8d756a27a2ca979ca52 100644
--- a/src/exdf/write/sd_writer.py
+++ b/src/exdf/write/sd_writer.py
@@ -323,8 +323,7 @@ def build_sources_index(sources):
         else:
             instrument_indices[sd.source] = {
                 grp: sd.data_counts(labelled=False, index_group=grp)
-                for grp in sd.index_groups
-            }
+                for grp in sd.index_groups}
 
     return control_indices, instrument_indices