diff --git a/python-temel/mutable.py b/python-temel/mutable.py
new file mode 100644
index 0000000..bae5e7d
--- /dev/null
+++ b/python-temel/mutable.py
@@ -0,0 +1,11 @@
+class Sample:
+    def __init__(self):
+        self.a = 10
+        self.b = 20
+
+s = Sample()
+print(s.a, s.b)                       # 10, 20
+
+s.a = 100
+s.b = 200
+print(s.a, s.b)                       # 100, 200