diff --git a/python/Chapter 1/Question1_3/ChapQ1.3.py b/python/Chapter 1/Question1_3/ChapQ1.3.py
index 1266f349..0301c5aa 100644
--- a/python/Chapter 1/Question1_3/ChapQ1.3.py	
+++ b/python/Chapter 1/Question1_3/ChapQ1.3.py	
@@ -6,7 +6,7 @@ def isPermutation(s1, s2):
         return False
     else:
         for char in s1:
-            if s2.find(char)==-1:
+            if char not in s2:
                 return False
             else:
                 s2 = s2.replace(char,"",1)