diff --git a/kjg/python-the-hard-way/e44a.py b/kjg/python-the-hard-way/e44a.py
new file mode 100644
index 0000000..211745e
--- /dev/null
+++ b/kjg/python-the-hard-way/e44a.py
@@ -0,0 +1,13 @@
+class Parent(object):
+    def implicit(self):
+        print("PARENT implicit()")
+
+
+class Child(Parent):
+    pass
+
+
+dad = Parent()
+son = Child()
+dad.implicit()
+son.implicit()
diff --git a/kjg/python-the-hard-way/e44b.py b/kjg/python-the-hard-way/e44b.py
new file mode 100644
index 0000000..0c94ffc
--- /dev/null
+++ b/kjg/python-the-hard-way/e44b.py
@@ -0,0 +1,14 @@
+class Parent(object):
+    def override(self):
+        print("PARENT override()")
+
+        
+class Child(Parent):
+    def override(self):
+        print("CHILD override()")
+
+
+dad = Parent()
+son = Child()
+dad.override()
+son.override()
diff --git a/kjg/python-the-hard-way/e44c.py b/kjg/python-the-hard-way/e44c.py
new file mode 100644
index 0000000..9d1dbe0
--- /dev/null
+++ b/kjg/python-the-hard-way/e44c.py
@@ -0,0 +1,16 @@
+class Parent(object):
+    def altered(self):
+        print("PARENT altered()")
+
+        
+class Child(Parent):
+    def altered(self):
+        print("CHILD, BEFORE PARENT altered()")
+        super(Child, self).altered()
+        print("CHILD, AFTER PARENT altered()")
+
+        
+dad = Parent()
+son = Child()
+dad.altered()
+son.altered()
diff --git a/kjg/python-the-hard-way/e44d.py b/kjg/python-the-hard-way/e44d.py
new file mode 100644
index 0000000..9c93926
--- /dev/null
+++ b/kjg/python-the-hard-way/e44d.py
@@ -0,0 +1,34 @@
+class Parent(object):
+
+    def override(self):
+        print("PARENT override()")
+
+    def implicit(self):
+        print("PARENT implicit()")
+
+    def altered(self):
+        print("PARENT altered()")
+
+
+class Child(Parent):
+    
+    def override(self):
+        print("CHILD, override()")
+
+    def altered(self):
+        print("CHILD, BERFORE altered()")
+        super(Child, self).altered()
+        print("CHILD, AFTER PARENT altered()")
+
+        
+dad = Parent()
+son = Child()
+
+dad.implicit()
+son.implicit()
+
+dad.override()
+son.override()
+
+dad.altered()
+son.altered()
diff --git a/kjg/python-the-hard-way/e44e.py b/kjg/python-the-hard-way/e44e.py
new file mode 100644
index 0000000..b5840cf
--- /dev/null
+++ b/kjg/python-the-hard-way/e44e.py
@@ -0,0 +1,32 @@
+class Other(object):
+    def override(self):
+        print("OTHER override()")
+
+    def implicit(self):
+        print("OTHER implicit()")
+
+    def altered(self):
+        print("OTHER altered()")
+
+
+class Child(object):
+    def __init__(self):
+        self.other = Other()
+
+    def implicit(self):
+        self.other.implicit()
+
+    def override(self):
+        print("CHILD override()")
+
+    def altered(self):
+        print("CHILD, BEFORE OTHER altered()")
+        self.other.altered()
+        print("CHILD, AFTER OTHER altered()")
+
+        
+son = Child()
+
+son.implicit()
+son.override()
+son.altered()
diff --git a/kjg/python.org b/kjg/python.org
index ecec546..273ecf9 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -147,5 +147,12 @@ How to use dictionary
 How to use class
 **** ex41
 practice class
+*** Python #9
 **** ex42
 review class and object
+*** Python #10
+**** ex43
+Analysis and Design object
+*** Python #11
+**** ex44
+difference with inheritance and compositon