git add example

python-temel/class.add.py

@@ -0,0 +1,24 @@
+class Number:
+    def __init__(self, val):
+        self.val = val
+
+    def __add__(self, x):
+        return Number(self.val + x.val)
+
+    def __iadd__(self, x):
+        return Number(self.val + x.val + 1)
+
+    def __repr__(self):
+        return str(self.val)
+
+a = Number(10)
+b = Number(20)
+
+a = a + b
+print(a)
+
+a = Number(10)
+b = Number(20)
+
+a += b
+print(a)