diff --git a/kjg/python-the-hard-way/baseballgame.py b/kjg/python-the-hard-way/baseballgame.py
new file mode 100644
index 0000000..a6f2f0e
--- /dev/null
+++ b/kjg/python-the-hard-way/baseballgame.py
@@ -0,0 +1,48 @@
+import baseballgameclass
+
+
+
+# initial fucntion
+size = []
+cGameNumber = baseballgameclass.GameNumber()
+guess = []
+checknewgame = 0
+inputset = {}
+inputset = set()
+
+# assign class
+cInputNumber = baseballgameclass.InputNumber()
+cCheckNumber = baseballgameclass.CheckNumber()
+cPrintResult = baseballgameclass.PrintResult()
+
+
+while True:
+
+    if checknewgame == 0:  # check new game
+        # get game size and max of number
+        size = cInputNumber.getGameSize()
+        inputset = cGameNumber.createNumberSet(size[1], size[0])
+        number = cGameNumber.createGameNumber(inputset)
+        checknewgame = 1
+    elif checknewgame != 3: # running game
+        while True:
+            guess = cInputNumber.getNumber(size[0]) # get created gaem number
+            result3 = cCheckNumber.compareNumber(number, guess) # compare input number and game number 
+            cPrintResult.printResult(result3) # print result
+            # print(number)
+            if result3[0] == size[0]:
+                print('You win.')
+                newgame = input('continue a game (y or n) : ')
+                if newgame == 'y': 
+                    checknewgame = 0 # continue game
+                    break
+                else:
+                    checknewgame = 3 # stop game
+                    break
+    elif checknewgame == 3: # exit game
+        break
+        
+                
+
+
+        
diff --git a/kjg/python-the-hard-way/baseballgameclass.py b/kjg/python-the-hard-way/baseballgameclass.py
new file mode 100644
index 0000000..1852d02
--- /dev/null
+++ b/kjg/python-the-hard-way/baseballgameclass.py
@@ -0,0 +1,115 @@
+import random
+
+
+class GameNumber():
+    # create game's numbers
+    
+    # create number set for game
+    def createNumberSet(self, amount, gamesize):
+        s = {}
+        s = set()
+        while len(s) < gamesize:
+            # add set as gamesize
+            s.add(random.randint(0, amount-1))
+
+        print(s)
+        return s
+        
+    # create game number list
+    def createGameNumber(self, gameSet): 
+        numbers = []
+        for k in gameSet:
+            numbers.append(k)
+            print(k)
+            
+        return numbers
+
+
+class CheckNumber():
+    # check number whether it is right
+    
+    # compare number between a guess answer and a right answer
+    def compareNumber(self, gameNumber, guessNumber):
+        result = []
+        strike = 0
+        ball = 0
+        
+        for i in range(len(gameNumber)):
+            print(guessNumber)
+            if guessNumber[i] == gameNumber[i]:
+                # check number of strke
+                strike += 1
+            elif guessNumber[i] in gameNumber:
+                # check number of ball
+                ball += 1
+
+        # add results of strike and ball
+        result.append(strike)
+        result.append(ball)
+
+        return result
+
+    
+class InputNumber():
+    # user inputs numbers
+    
+    def getGameSize(self):
+        amountNumber = []
+        while True:  # check wrong input 
+            temp = input('put a game size : ')
+            try:
+                if len(temp) > 1:
+                    raise
+                
+                for i in temp:
+                    if i not in '0123456789':
+                        raise
+            except:
+                print('it is not number or too big, input  again')
+            else:
+                amountNumber.append(int(temp))
+                break
+
+        while True:   # check wrong input
+            temp = input('put a max of number : ')
+            try:
+                if len(temp) > 1:
+                    raise
+
+                for i in temp:
+                    if i not in '0123456789':
+                        raise
+            except:
+                print('it is not number or too big, input again')
+            else:
+                amountNumber.append(int(temp))
+
+                return amountNumber
+            
+    def getNumber(self, gameSize):
+        userGuess = []
+        for i in range(gameSize):
+            while True:  # check wrong input
+                print('put ', i+1, ' of numbers : ', end='')
+                temp2 = input()
+                try:
+                    if len(temp2) > 1:
+                        raise
+
+                    for k in temp2:
+                        if k not in '0123456789':
+                            raise
+                except:
+                    print('it is not number or too big, input  again')
+                else:
+                    userGuess.append(int(temp2))
+                    break
+
+        return userGuess
+
+
+class PrintResult():
+    # print result
+
+    def printResult(self, result):
+        print(result[0], ' strike, ', result[1], ' ball')
diff --git a/kjg/python-the-hard-way/calc.py b/kjg/python-the-hard-way/calc.py
new file mode 100644
index 0000000..765e795
--- /dev/null
+++ b/kjg/python-the-hard-way/calc.py
@@ -0,0 +1,35 @@
+from sys import argv
+
+script, file_name = argv
+
+
+def input_and_calculate_one_line():
+    txt_result = ''
+    number = input("> ")
+    if number == 'q':
+        txt_result = ''
+        return txt_result
+    
+    sp_number = number.split(' ')
+    for i in range(len(sp_number) - 1):
+        txt_result = txt_result + sp_number[i] + ' + '
+    
+    sp_number = list(map(int, sp_number))
+    result = sum(sp_number)
+    txt_result = txt_result + str(sp_number[-1]) + ' = ' + str(result) + '\n'
+    return txt_result
+
+
+def editor():
+    txt = open(file_name, 'w')
+    while True:
+        output = input_and_calculate_one_line()
+        if output == '':
+            txt.close()
+            exit(0)
+        else:
+            print(output)
+            txt.write(output)
+
+
+editor()
diff --git a/kjg/python-the-hard-way/e37.py b/kjg/python-the-hard-way/e37.py
new file mode 100644
index 0000000..185cad8
--- /dev/null
+++ b/kjg/python-the-hard-way/e37.py
@@ -0,0 +1,26 @@
+while 1:
+    money = input("insert coin=>")
+    number = input("select beverage\n")
+    money = int(money)
+    temp = money
+    if number == "1":
+        #grape 100
+        print("you choose grape. change is ",money-100,"coin")
+        money = temp-100 #callculate change
+        if money <= 0:  #check money
+            break
+    elif number == "2":
+        #orange 200
+        print("you choose orange. change is ",money-200,"coin")
+        money = temp-200 #callculate change
+        if money <= 0:  #check money
+            break
+    elif number == "3":
+        #fanta 300
+        print("you choose fanta. change is ",money-300,"coin")
+        money = temp-300 #callculate change
+        if money <= 0: #check money
+            break
+    else:
+        #wrong sellection
+        print("wrong number. please select again")
diff --git a/kjg/python-the-hard-way/e38.py b/kjg/python-the-hard-way/e38.py
new file mode 100644
index 0000000..f1e1923
--- /dev/null
+++ b/kjg/python-the-hard-way/e38.py
@@ -0,0 +1,17 @@
+ten_things = "Apples Oranges Crows Telephone Light Sugar"
+
+print("Wait there are not 10 things in that list. Let's fix that.")
+
+stuff = ten_things.split(' ')
+more_stuff = ["Day", "Night", "Song", "Frisbee","Corn", "Banana", "Girl", "Boy"]
+while len(stuff) != 10:
+    next_one = more_stuff.pop()
+    print("Adding: ", next_one)
+    stuff.append(next_one)
+    print(f"There are {len(stuff)} items now.")
+    print("There we go: ", stuff)
+    print("Let's do some things with stuff.")
+    print(stuff[1])
+    print(stuff[-1]) # whoa! fancy print(stuff.pop())
+    print(' '.join(stuff)) # what? cool!
+    print('#'.join(stuff[3:5])) # super stellar!
diff --git a/kjg/python-the-hard-way/e39.py b/kjg/python-the-hard-way/e39.py
new file mode 100644
index 0000000..087d013
--- /dev/null
+++ b/kjg/python-the-hard-way/e39.py
@@ -0,0 +1,66 @@
+# create a mapping of state to abbreviation
+states = {
+    'Kyungsangdo': 'KS',
+    'Kangwondo': 'KW',
+    'Jeju': 'JE',
+    'Junlado': 'JL',
+    'Chungchungdo': 'CC'
+}
+
+# create a basic set of states and some cities in them
+cities = {
+    'KS': 'Busan',
+    'JE': 'Jejusi',
+    'JL': 'Mokpo'
+}
+
+# add some more cities
+cities['KW'] = 'Sokcho'
+cities['CC'] = 'Chungju'
+
+# print out some cities
+print('-' * 10)
+print("KS State has: ", cities['KS'])
+print("KW State has: ", cities['KW'])
+
+# print some states
+print('-' * 10)
+print("Kyungsangdo's abbreviation is: ", states['Kyungsangdo'])
+print("Kangwondo's abbreviation is: ", states['Kangwondo'])
+
+# do it by using the state then cities dict
+print('-' * 10)
+print("Jeju has: ", cities[states['Jeju']])
+print("Junlado has: ", cities[states['Junlado']])
+
+# print every state abbreviation
+print('-' * 10)
+for state, abbrev in list(states.items()):
+    print(f"{state} is abbreviated {abbrev}")
+
+# print every city in state
+print('-' * 10)
+for abbrev, city in list(cities.items()):
+    print(f"{abbrev} has the city {city}")
+
+
+# now do both at the same time
+print('-' * 10)
+for state, abbrev in list(states.items()):
+    print(f"{state} state is abbreviated {abbrev}")
+    print(f"and has city {cities[abbrev]}")
+
+
+print('-' * 10)
+# safely get a abbreviation by state that might not be there
+state = states.get('Texas')
+
+if not state:
+    print("Sorry, no Texas.")
+    
+
+# get a city with a default value
+city = cities.get('TX', 'Does Not Exist')
+print(f"The city for the state 'TX' is: {city}")
+
+
diff --git a/kjg/python-the-hard-way/e40.py b/kjg/python-the-hard-way/e40.py
new file mode 100644
index 0000000..31f5dbe
--- /dev/null
+++ b/kjg/python-the-hard-way/e40.py
@@ -0,0 +1,20 @@
+class Song(object):
+    def __init__(self, lyrics):
+        self.lyrics = lyrics
+        
+    def sing_me_a_song(self):
+        for line in self.lyrics:
+            print(line)
+
+            
+ly1 = ["Happy birthday to you", "I don't want to get sued", "So I'll stop right there"]
+ly2 = ["They rally around tha family","With pockets full of shells"]
+
+happy_bday = Song(ly1)
+
+bulls_on_parade = Song(ly2)
+
+
+happy_bday.sing_me_a_song()
+
+bulls_on_parade.sing_me_a_song()
diff --git a/kjg/python-the-hard-way/e41.py b/kjg/python-the-hard-way/e41.py
new file mode 100644
index 0000000..7c6bc61
--- /dev/null
+++ b/kjg/python-the-hard-way/e41.py
@@ -0,0 +1,87 @@
+import random
+from urllib.request import urlopen
+import sys
+
+WORD_URL = "http://learncodethehardway.org/words.txt"
+WORDS = []
+
+PHRASES = {
+    "class %%%(%%%):":
+    "Make a class named %%% that is-a %%%.",
+    "class %%%(object):\n\tdef __init__(self, ***)" :
+    "class %%% has-a __init__ that takes self and *** params.",
+    "class %%%(object):\n\tdef ***(self, @@@)":
+    "class %%% has-a function *** that takes self and @@@ params.",
+    "*** = %%%()":
+    "Set *** to an instance of class %%%.",
+    "***.***(@@@)":
+    "From *** get the *** function, call it with params self, @@@.",
+    "***.*** = '***'":
+    "From *** get the *** attribute and set it to '***'."
+}
+
+# do they want to drill phrases first
+if len(sys.argv) == 2 and sys.argv[1] == "english":
+    PHRASE_FIRST = True
+else:
+    PHRASE_FIRST = False
+
+
+# load up the words from the website
+for word in urlopen(WORD_URL).readlines():
+    WORDS.append(str(word.strip(), encoding="utf-8"))
+
+
+def convert(snippet, phrase):
+    class_names = [w.capitalize() for w in
+                   random.sample(WORDS, snippet.count("%%%"))]
+    other_names = random.sample(WORDS, snippet.count("***"))
+    results = []
+    param_names = []
+
+    for i in range(0, snippet.count("@@@")):
+        param_count = random.randint(1,3)
+        param_names.append(', '.join(
+            random.sample(WORDS, param_count)))
+
+    for sentence in snippet, phrase:
+        # this is how you duplicate a list or string
+        result = sentence[:]
+
+        # fake class names
+        for word in class_names:
+            result = result.replace("%%%", word, 1)
+
+        # fake other names
+        for word in other_names:
+            result = result.replace("***", word, 1)
+
+        # fake parameter lists
+        for word in param_names:
+            result = result.replace("@@@", word, 1)
+
+        results.append(result)
+    return results
+
+
+# keep going until they hit CTRL-D
+try:
+    while True:
+        snippets = list(PHRASES.keys())
+        random.shuffle(snippets)
+
+        for snippet in snippets:
+            phrase = PHRASES[snippet]
+            question, answer = convert(snippet, phrase)
+            if PHRASE_FIRST:
+                question, answer = answer, question
+
+                print(question)
+                input("> ")
+                print(f"ANSWER:  {answer}\n\n")
+                
+except EOFError:
+    print("\nBye")
+
+
+
diff --git a/kjg/python-the-hard-way/e42.py b/kjg/python-the-hard-way/e42.py
new file mode 100644
index 0000000..0690618
--- /dev/null
+++ b/kjg/python-the-hard-way/e42.py
@@ -0,0 +1,83 @@
+## Animal is-a object (yes, sort of confusing) look at the extra credit
+class Animal(object):
+    def something(self):
+        print("base")
+
+
+## Dog is-a Animal
+class Dog(Animal):
+    def __init__(self, name):
+        ## Dog has-a name
+        self.name = name
+
+        
+## Cat is-a Animal
+class Cat(Animal):
+    def __init__(self, name):
+        ## Cat has-a name
+        self.name = name
+
+        
+## Person is-a object
+class Person(object):
+    def __init__(self, name):
+        ## Person has-a name
+        self.name = name
+        ## Person has-a pet of some kind
+        self.pet = None
+
+        
+## Employee is-a person
+class Employee(Person):
+    def __init__(self, name, salary):
+        ## heritage from parents
+        super(Employee, self).__init__(name)
+        ## Employee has-a salary
+        self.salary = salary
+
+        
+## Fish is-a object
+class Fish(object):
+    def __init__(self):
+        print("Base Fish")
+
+
+## Salmon is-a Fish
+class Salmon(Fish):
+    pass
+
+
+## Halibut is-a Fish
+class Halibut(Fish):
+    pass
+
+
+## rover is-a Dog
+rover = Dog("Rover")
+rover.something()
+## satan is-a Cat
+satan = Cat("Satan")
+
+## mary is-a Person
+mary = Person("Mary")
+
+## mary's pet is satan
+mary.pet = satan
+print(mary.pet.name)
+
+## frank is-a Employee
+frank = Employee("Frank", 120000)
+
+## frank's pet is rover
+frank.pet = rover
+print(frank.name)
+print(frank.pet.name)
+print(frank.salary)
+## flipper is-a Fish
+flipper = Fish()
+
+## crouse is-a Salmon
+crouse = Salmon()
+
+## harry is-a Halibut
+harry = Halibut()
diff --git a/kjg/python-the-hard-way/e43.py b/kjg/python-the-hard-way/e43.py
new file mode 100644
index 0000000..d0f8fa3
--- /dev/null
+++ b/kjg/python-the-hard-way/e43.py
@@ -0,0 +1,253 @@
+from sys import exit
+from random import randint
+from textwrap import dedent
+
+
+class Scene(object):
+    def enter(self):
+        print("This scene is not yet configured.")
+        print("Subclass it and implement enter().")
+        exit(1)
+
+
+class Engine(object):
+    def __init__(self, scene_map):
+        self.scene_map = scene_map
+
+    def play(self):
+        current_scene = self.scene_map.opening_scene()
+        last_scene = self.scene_map.next_scene('finished')
+
+        while current_scene != last_scene:
+            next_scene_name = current_scene.enter()
+            current_scene = self.scene_map.next_scene(next_scene_name)
+
+        # be sure to print out the last scene
+        current_scene.enter()
+
+
+class Death(Scene):
+    quips = [
+        "You died.  You kinda suck at this.",
+        "Your Mom would be proud...if she were smarter.",
+        "Such a luser.",
+        "I have a small puppy that's better at this.",
+        "You're worse than your Dad's jokes."
+    ]
+
+    def enter(self):
+        print(Death.quips[randint(0, len(self.quips)-1)])
+        exit(1)
+
+        
+class CentralCorridor(Scene):
+    def enter(self):
+        print(dedent("""
+              The Gothons of Planet Percal #25 have invaded your ship and
+              destroyed your entire crew. You are the last surviving
+              member and your last mission is to get the neutron destruct
+              bomb from the Weapons Armory, put it in the bridge, and
+              blow the ship up after getting into an escape pod.
+
+              You're running down the central corridor to the Weapons
+              Armory when a Gothon jumps out, red scaly skin, dark grimy
+              teeth, and evil clown costume flowing around his hate
+              filled body. He's blocking the door to the Armory and
+              about to pull a weapon to blast you.
+              """))
+
+        action = input("> ")
+
+        if action == "handshake!":
+            print(dedent("""
+                  Quick on the draw you yank out your blaster and fire
+                  it at the Gothon. His clown costume is flowing and
+                  moving around his body, which throws off your aim.
+                  Your laser hits his costume but misses him entirely.
+                  This completely ruins his brand new costume his mother
+                  bought him, which makes him fly into an insane rage
+                  and blast you repeatedly in the face until you are
+                  dead. Then he eats you.
+                  """))
+            return 'death'
+        elif action == "dodge!":
+            print(dedent("""
+                  Like a world class boxer you dodge, weave, slip and
+                  slide right as the Gothon's blaster cranks a laser
+                  past your head. In the middle of your artful dodge
+                  your foot slips and you bang your head on the metal
+                  wall and pass out. You wake up shortly after only to
+                  die as the Gothon stomps on your head and eats you.
+                  """))
+            return 'death'
+
+        elif action == "tell a joke":
+            print(dedent("""
+                  Lucky for you they made you learn Gothon insults in
+                  the academy. You tell the one Gothon joke you know:
+                  Lbhe zbgure vf fb sng, jura fur fvgf nebhaq gur ubhfr,
+                  fur fvgf nebhaq gur ubhfr. The Gothon stops, tries
+                  not to laugh, then busts out laughing and can't move.
+                  While he's laughing you run up and shoot him square in
+                  the head putting him down, then jump through the
+                  Weapon Armory door.
+                  """))
+            return 'laser_weapon_armory'
+        
+        elif action == "cheat game":
+            print(dedent("""
+                  you pass the gaem
+                  You win the gaem
+                  """))
+            return 'finished'
+        else:
+            print("DOES NOT COMPUTE!")
+            return 'central_corridor'
+
+
+class LaserWeaponArmory(Scene):
+    def enter(self):
+        print(dedent("""
+              You do a dive roll into the Weapon Armory, crouch and scan
+              the room for more Gothons that might be hiding. It's dead
+              quiet, too quiet. You stand up and run to the far side of
+              the room and find the neutron bomb in its container.
+              There's a keypad lock on the box and you need the code to
+              get the bomb out. If you get the code wrong 10 times then
+              the lock closes forever and you can't get the bomb. The
+              code is 3 digits.
+              """))
+        
+        code = f"{randint(1,9)}{randint(1,9)}{randint(1,9)}"
+        guess = input("[keypad]> ")
+        guesses = 0
+
+        while guess != code and guesses < 10:
+            print("BZZZZEDDD!")
+            guesses += 1
+            guess = input("[keypad]> ")
+
+        if guess == code:
+            print(dedent("""
+                  The container clicks open and the seal breaks, letting
+                  gas out. You grab the neutron bomb and run as fast as
+                  you can to the bridge where you must place it in the
+                  right spot.
+                  """))
+            return 'the_bridge'
+        else:
+            print(dedent("""
+                  The lock buzzes one last time and then you hear a
+                  sickening melting sound as the mechanism is fused
+                  together. You decide to sit there, and finally the
+                  Gothons blow up the ship from their ship and you die.
+                  """))
+            return 'death'
+
+        
+class TheBridge(Scene):
+    def enter(self):
+        print(dedent("""
+              You burst onto the Bridge with the netron destruct bomb
+              under your arm and surprise 5 Gothons who are trying to
+              take control of the ship. Each of them has an even uglier
+              clown costume than the last. They haven't pulled their
+              weapons out yet, as they see the active bomb under your
+              arm and don't want to set it off.
+              """))
+
+        action = input("> ")
+
+        if action == "throw the bomb":
+            print(dedent("""
+                  In a panic you throw the bomb at the group of Gothons
+                  and make a leap for the door. Right as you drop it a
+                  Gothon shoots you right in the back killing you. As
+                  you die you see another Gothon frantically try to
+                  disarm the bomb. You die knowing they will probably
+                  blow up when it goes off.
+                  """))
+            return 'death'
+        elif action == "slowly place the bomb":
+            print(dedent("""
+                  You point your blaster at the bomb under your arm and
+                  the Gothons put their hands up and start to sweat.
+                  You inch backward to the door, open it, and then
+                  carefully place the bomb on the floor, pointing your
+                  blaster at it. You then jump back through the door,
+                  punch the close button and blast the lock so the
+                  Gothons can't get out. Now that the bomb is placed
+                   you run to the escape pod to get off this tin can.
+                   """))
+            return 'escape_pod'
+        else:
+            print("DOES NOT COMPUTE!")
+            return "the_bridge"
+
+
+class EscapePod(Scene):
+    def enter(self):
+        print(dedent("""
+              You rush through the ship desperately trying to make it to
+              the escape pod before the whole ship explodes. It seems
+              like hardly any Gothons are on the ship, so your run is
+              clear of interference. You get to the chamber with the
+              escape pods, and now need to pick one to take. Some of
+              them could be damaged but you don't have time to look.
+              There's 5 pods, which one do you take?
+              """))
+
+        good_pod = randint(1,5)
+        guess = input("[pod #]> ")
+
+        if int(guess) != good_pod:
+            print(dedent(f"""
+                  You jump into pod {guess} and hit the eject button.
+                  The pod escapes out into the void of space, then 
+                  implodes as the hull ruptures, crushing your body into 
+                  jam jelly.
+                  """))
+            return 'death'
+        else:
+            print(dedent(f"""
+                  You jump into pod {guess} and hit the eject button.
+                  The pod easily slides out into space heading to the
+                  planet below.  As it flies to the planet, you look
+                  back and see your ship implode then explode like a
+                  bright star, taking out the Gothon ship at the same
+                  time.  You won!
+                  """))
+            
+            return 'finished'
+
+        
+class Finished(Scene):
+    def enter(self):
+        print("You won! Good job.")
+        return 'finished'
+
+
+class Map(object):
+    scenes = {
+        'central_corridor': CentralCorridor(),
+        'laser_weapon_armory': LaserWeaponArmory(),
+        'the_bridge': TheBridge(),
+        'escape_pod': EscapePod(),
+        'death': Death(),
+        'finished': Finished(),
+    }
+    
+    def __init__(self, start_scene):
+        self.start_scene = start_scene
+
+    def next_scene(self, scene_name):
+        val = Map.scenes.get(scene_name)
+        return val
+
+    def opening_scene(self):
+        return self.next_scene(self.start_scene)
+    
+
+a_map = Map('central_corridor')
+a_game = Engine(a_map)
+a_game.play()
diff --git a/kjg/python-the-hard-way/e43_classes.py b/kjg/python-the-hard-way/e43_classes.py
new file mode 100644
index 0000000..c3fc85c
--- /dev/null
+++ b/kjg/python-the-hard-way/e43_classes.py
@@ -0,0 +1,52 @@
+class Scene(object):
+    def enter(self):
+        pass
+
+
+class Engine(object):
+    def __init__(self, scene_map):
+        pass
+    
+    def play(self):
+        pass
+
+    
+class Death(Scene):
+    def enter(self):
+        pass
+
+    
+class CentralCorridor(Scene):
+    def enter(self):
+        pass
+
+    
+class LaserWeaponArmory(Scene):
+    def enter(self):
+        pass
+
+    
+class TheBridge(Scene):
+    def enter(self):
+        pass
+
+    
+class EscapePod(Scene):
+    def enter(self):
+        pass
+
+    
+class Map(object):
+    def __init__(self, start_scene):
+        pass
+
+    def next_scene(self, scene_name):
+        pass
+
+    def opening_scene(self):
+        pass
+
+    
+a_map = Map('central_corridor')
+a_game = Engine(a_map)
+a_game.play()
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-the-hard-way/sum.txt b/kjg/python-the-hard-way/sum.txt
new file mode 100644
index 0000000..e69de29
diff --git a/kjg/python.org b/kjg/python.org
index 19204ce..8cd37fc 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -133,3 +133,28 @@ How to use Accessing Elements of Lists
 practice function, while, if
 **** ex36
 some rules of if, loop and tips for debugging
+*** Python applying learnings from 1..6
+create calc.py
+*** Python #7
+**** ex37
+analysis sample codes
+**** ex38
+append list
+**** ex39
+How to use dictionary
+*** Python #8
+**** ex40
+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
+*** Python #12
+create game