diff --git a/common_module.py b/common_module.py
index e0f8966..cbd6490 100644
--- a/common_module.py
+++ b/common_module.py
@@ -8,7 +8,7 @@ class CommonModule:
 
     @classmethod
     def len_by_full (cls, string: str) -> float:
-        return sum ([1 if cls.is_wide (c) else .5 for c in string])
+        return sum (1 if cls.is_wide (c) else .5 for c in string)
 
     @classmethod
     def index_by_f2c (cls, string: str, index: float) -> int: