completing Inheritance and Polymorphism - section4 python beyond the basics OOP

Author: Quarkblue

Inheritance and Polymorphism/composition_versus_inheritance.py

@@ -0,0 +1,37 @@
+# Composition versus Inheritance
+# Python beyonds the basics - Object oriented programming
+
+"""
+Inheritance can be brittle(a change may require changes
+elsewhere)
+Decoupled code is classes, functions, etc. that work
+independently and don't depend on one another.
+As long as the interface is maintained, interactions between
+classes will work.
+Not checking or requiring particular types in polymorphic and
+pythonic
+"""
+
+import random
+import StringIO
+
+class WriteMyStuff(object):
+    
+    def __init__(self,writer):
+        self.writer = writer
+        
+    def write(self):
+        write_text = "This is a message"
+        self.writer.write(write_text)
+        
+        
+fh = open('test.txt', 'w')
+w1 = WriteMyStuff(fh)
+w1.write()
+fh.close()
+
+
+sioh = StringIO.StringIO()
+w2 = WriteMyStuff(sioh)
+
+w2.write()

Inheritance and Polymorphism/method_overloading_extending_and_providing.py

@@ -1,5 +1,13 @@
 # Method Overloading - Extending and Providing
 # Python beyond the basics - object oriented programming
+"""
+When working in a child class we can choose to implement parent
+class methods in different ways
+    Inherit : simply use the parent class defined methods
+    Override/overload : provide childs own version of a method
+    Extend : do work in addition to that in parent's methods
+    provide : implement abstract method that parent requires
+"""
 
 import abc