diff --git a/utils/__init__.py b/utils/__init__.py
index 190dbd7..e4de308 100644
--- a/utils/__init__.py
+++ b/utils/__init__.py
@@ -10,11 +10,11 @@
 
 def compile_pairs(nodes):
     result = {}
-    if len(nodes) %2 != 0:
+    if len(nodes) % 2 != 0:
         nodes.pop(1)
     pairs = list(zip(*[iter(nodes)] * 2))
     for pair in pairs:
-        result[pair[0]+'<>'+pair[1]] = pair
+        result[pair[0] + '<>' + pair[1]] = pair
     return result