diff --git a/src/main/py/read_math_function.py b/src/main/py/read_math_function.py
index 150f76e..4470d08 100644
--- a/src/main/py/read_math_function.py
+++ b/src/main/py/read_math_function.py
@@ -4,5 +4,4 @@ def read_constant(type, value):
     return value
 
 def is_string(value):
-    result = isinstance(value, str)
-    return result
+    return isinstance(value, str)