diff --git a/README.md b/README.md
index 6192cf8..c324a48 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,2 @@
 # Data-Structures
-This repository contains implementation of data structures in java.
+This repository contains implementation of data structures in java and python.
diff --git a/hammer.py b/hammer.py
new file mode 100644
index 0000000..ecf5b41
--- /dev/null
+++ b/hammer.py
@@ -0,0 +1,11 @@
+class hammer(object):
+    def dna(self,str1,str2):
+        self.str1=str1
+        self.str2=str2
+        j=0
+        c=0
+        for i in str1:
+            if i!=self.str2[j]:
+                c+=1
+            j+=1
+        print c