diff --git a/pyerrors/input/utils.py b/pyerrors/input/utils.py
index a8dd026e..66b60f68 100644
--- a/pyerrors/input/utils.py
+++ b/pyerrors/input/utils.py
@@ -1,14 +1,15 @@
 """Utilities for the input"""
 
-def check_idl(idl,che):
+
+def check_idl(idl, che):
     missing = []
     for c in che:
-        if not c in idl:
+        if c not in idl:
             missing.append(c)
-    #print missing such that it can directly be parsed to slurm terminal
+    # print missing such that it can directly be parsed to slurm terminal
     if not (len(missing) == 0):
-        print(len(missing),"configs missing")
+        print(len(missing), "configs missing")
         miss_str = str(missing[0])
         for i in missing[1:]:
-            miss_str += ","+str(i)
+            miss_str += "," + str(i)
         print(miss_str)