* Added 39-method-overloading-3.py

Author: Vimal

39-method-overloading-3.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+
+# 39-method-overloading-3.py
+
+# We've seen that inherited methods can be overloaded.
+# This is possible using in-built functions as well.
+
+# Let's see how we can overload methods from the `list` module.
+
+
+class MyList(list):
+
+    def __getitem__(self, index):
+        if index == 0:
+            raise IndexError
+        if index > 0:
+            index -= 1
+        return list.__getitem__(self, index)
+
+    def __setitem__(self, index, value):
+        if index == 0:
+            raise IndexError
+        if index > 0:
+            index -= 1
+        list.__setitem__(self, index, value)
+
+x = MyList(['a', 'b', 'c'])
+print(x)
+print("-" * 10)
+
+x.append('d')
+print(x)
+print("-" * 10)
+
+x.__setitem__(4, 'e')
+print(x)
+print("-" * 10)
+
+print(x[1])
+print(x.__getitem__(1))
+print("-" * 10)
+
+print(x[4])
+print(x.__getitem__(4))