diff --git a/.gitignore b/.gitignore
index a7ddd91..9e3973d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
-/youngjin.han/dot-cdist/type/__my_computer/manifest~
-/youngjin.han/cdist.org~
-/youngjin.han/dot-cdist/type/__colourful_file/file/colourful~
-/youngjin.han/dot-cdist/type/__colourful_file/manifest~
+manifest~
+*.py~
+*.org~
+*.org#
diff --git a/youngjin.han/dot-cdist/manifest/init b/youngjin.han/dot-cdist/manifest/init
index 1de48dc..0e17cc0 100644
--- a/youngjin.han/dot-cdist/manifest/init
+++ b/youngjin.han/dot-cdist/manifest/init
@@ -8,7 +8,7 @@ case "$__target_host" in
 #        __colourful_file --colour yellow --colour blue --colour red --colour green
 #        __my_dotfiles
 #        __my_nginx_site $__target_host
-#	__all_in_one $__target_host --with-x --extra-packages tree --extra-packages htop
+#	__all_in_one --with-x --extra-packages tree --extra-packages htop
 	__my_firewall --file /etc/my-nftables
     ;;
     jafo.laptop)
diff --git a/youngjin.han/dot-cdist/type/__all_in_one/manifest b/youngjin.han/dot-cdist/type/__all_in_one/manifest
index ee5f9a7..cf18e7b 100755
--- a/youngjin.han/dot-cdist/type/__all_in_one/manifest
+++ b/youngjin.han/dot-cdist/type/__all_in_one/manifest
@@ -1,12 +1,10 @@
 #!/bin/sh -e
 
 os="$(cat "$__global/explorer/os")"
-default_package_name="socat sipalc sudo"
+default_package_name="socat sipcalc sudo"
 
 if [ -f "$__object/parameter/with-x" ]; then
     with_x="$(cat "$__object/parameter/with-x")"
-else
-    with_x="$__object_id"
 fi
 
 case "$os" in
@@ -14,7 +12,7 @@ case "$os" in
         name_netcat="netcat-openbsd"
         name_wireshark="tshark"
      ;;
-     debian)
+     debian|devuan)
         name_netcat="netcat"
         name_wireshark="tshark"
      ;;
@@ -33,12 +31,12 @@ all_package_name="$default_package_name $name_netcat $name_wireshark"
 
 __package_update_index
 
-for package in $all_package_name;
-    do require="__apt_update_index" __package $package --state=present
+for package in $all_package_name; do
+    require="__package_update_index" __package $package --state=present
 done
 
 if [ -f "$__object/parameter/extra-packages" ]; then
     for package in $(cat "$__object/parameter/extra-packages"); do
-        require="__apt_update_index" __package $package --state=present
+        require="__package_update_index" __package $package --state=present
     done
 fi
diff --git a/youngjin.han/dot-cdist/type/__all_in_one/singleton b/youngjin.han/dot-cdist/type/__all_in_one/singleton
new file mode 100644
index 0000000..e69de29
diff --git a/youngjin.han/learning-node02-2020.org b/youngjin.han/learning-node02-2020.org
index 52a96fb..687a0c3 100644
--- a/youngjin.han/learning-node02-2020.org
+++ b/youngjin.han/learning-node02-2020.org
@@ -1,3 +1,35 @@
+* 2020-05-20
+*** Python #2:
+**** DONE Lecture content
+     CLOSED: [2020-05-20 수 22:47]
+     - Read thoroughly & do exercises 8 to 14
+       - Focus on understanding
+       - You don't have to type everything
+       - But you should ensure you understand everything
+     - Commit all source code to ~/ungleich-learning-circle/USERNAME/python-the-hard-way
+     - Write down notes / what you learned in the *python.org* file
+     - Notify your fellow students when you solved something
+       - "I just solved exercise 4!"
+**** Lecture material
+     - Available on https://cloud.ungleich.ch/s/435FyfrQyEq6oF3
+* 2020-05-15
+*** Python #1:
+**** Lecture notes
+     - Ensure that you have python3 (at least 3.6) installed
+     - Use emacs for editing source files
+     - Commit all source code to ~/ungleich-learning-circle/USERNAME/python-the-hard-way
+**** DONE Lecture content
+     CLOSED: [2020-05-19 화 23:47]
+     - Read thoroughly & do exercise 0 to 7
+     - Commit your source code in git
+     - Commit every time you have a task done
+       - Make a new commit in git each time you finish (part of) a task
+     - Do all exercises
+     - Notify your fellow students when you solved something
+     - Ask help to other students when you are stuck (but try to solve
+       on your own before)
+**** Lecture material
+     - Available on https://cloud.ungleich.ch/s/435FyfrQyEq6oF3
 * 2020-05-15
 *** cdist #6: Glueing it together
 **** Lecture content
@@ -20,7 +52,7 @@
         Alpine/Debian/Fedora, output an error message and abort the
         manifest with exit code 1
       - Additionally install all packages specified by the *--extra-packages* parameter
-***** Steps 2: *__firewall* (1.25h)
+***** TODO Steps 2: *__firewall* (1.25h)
       - Create a new type *__my_firewall*
       - Add a *type explorer* to find out whether nft is present on
         the target system
@@ -33,7 +65,7 @@
         ruleset by generating code in *gencode-remote*
       - If the filename specified by the *file* parameter is *-* (the
         minus sign), then the type should read from *stdin*
-***** Step 3: manifest (0.5h)
+***** TODO Step 3: manifest (0.5h)
       - Create a new manifest in the folder that contains the initial manifest
       - Name the new manifest *firewall*
       - Source the *firewall* manifest in the *initial* manifest
@@ -127,201 +159,146 @@
 ***** DONE As usual commit all changes to your ungleich-learning-circle repo
       CLOSED: [2020-05-15 금 21:07]
 * 2020-05-06
-** cdist #2: Your first cdist type
+*** cdist #2: Your first cdist type
 **** Lecture content
 ***** Objective
 ****** Begin to understand how cdist types function
 ***** Steps
-****** DONE Create a new type named `__my_computer`
-       CLOSED: [2020-05-06 수 22:53]
-******* DONE Mark the type as a singleton type
-        CLOSED: [2020-05-06 수 22:53]
-******* DONE Create a `manifest` file in it
-        CLOSED: [2020-05-06 수 22:53]
-******* DONE Use this type to install the following packages: zsh, mosh, emacs, nmap, sipcalc
-        CLOSED: [2020-05-06 수 22:53]
-******* DONE Edit the *initial manifest* and use **__my_computer** for **localhost**
-        CLOSED: [2020-05-06 수 22:53]
-******* DONE Match using the $__target_host variable
-        CLOSED: [2020-05-06 수 22:53]
-****** DONE Modify your type to use a *for loop* to install the packages
-       CLOSED: [2020-05-06 수 22:53]
-****** DONE Deploy / manage your ~/.emacs file in this type
-       CLOSED: [2020-05-06 수 22:53]
-******* DONE Ensure that permissions and ownership are correct
-        CLOSED: [2020-05-06 수 22:53]
-****** DONE Use different *verbosity* levels when configuring
-       CLOSED: [2020-05-06 수 22:54]
-****** DONE Ensure that all your changes are committed and pushed in your ungleich-learning-circle repository
-       CLOSED: [2020-05-06 수 22:54]
-******* DONE Use magit inside emacs for that
-        CLOSED: [2020-05-06 수 22:54]
-***** DONE Documentation steps to be done in cdist.org
-      CLOSED: [2020-05-06 수 23:02]
-****** DONE Create a new org document named `cdist.org` in the same folder as the learning.org file
-       CLOSED: [2020-05-06 수 23:02]
-****** DONE Explain the difference between a singleton and non-singleton type
-       CLOSED: [2020-05-06 수 23:02]
-****** DONE Explain the difference between the different verbosity levels
-       CLOSED: [2020-05-06 수 23:02]
-****** Document (copy&paste) some of the cdist runs in a "log" section```
+****** Create a new type named `__my_computer`
+        - Mark the type as a singleton type
+        - Create a `manifest` file in it
+        - Use this type to install the following packages: zsh, mosh, emacs, nmap, sipcalc
+        - Edit the *initial manifest* and use **__my_computer** for **localhost**
+        - Match using the $__target_host variable
+****** Modify your type to use a *for loop* to install the packages
+****** Deploy / manage your ~/.emacs file in this type
+       - Ensure that permissions and ownership are correct
+****** Use different *verbosity* levels when configuring
+****** Ensure that all your changes are committed and pushed in your ungleich-learning-circle repository
+       - Use magit inside emacs for that
+***** Documentation steps to be done in cdist.org
+       - Create a new org document named `cdist.org` in the same folder as the learning.org file
+       - Explain the difference between a singleton and non-singleton type
+       - Explain the difference between the different verbosity levels
+       - Document (copy&paste) some of the cdist runs in a "log" section```
 * 2020-05-04
 *** cdist #1: Introduction
 **** Lecture content
 ***** Objective
-****** Begin to use cdist
+      - Begin to use cdist
 ***** Steps
-****** DONE Checkout cdist quickstart https://www.cdi.st/manual/latest/cdist-quickstart.html
-       CLOSED: [2020-05-04 월 22:32]
-****** DONE Install cdist locally
-       CLOSED: [2020-05-04 월 22:32]
-****** DONE Create a new cdist configuration directory in ~/ungleich-learning-circle/USERNAME/dot-cdist
-       CLOSED: [2020-05-04 월 22:32]
-****** DONE Create an empty initial manifest ("use touch")
-       CLOSED: [2020-05-04 월 22:32]
-****** DONE Commit that status
-       CLOSED: [2020-05-04 월 22:37]
-****** DONE Ensure that you can login as root to localhost via ssh without a password
-       CLOSED: [2020-05-04 월 22:37]
-****** DONE Configure cdist to configures the motd of your localhost
-       CLOSED: [2020-05-05 화 00:42]
-******* DONE Ensure you have a case block matching on $__target_host
-        CLOSED: [2020-05-05 화 00:21]
-******* DONE Use the -c parameter to cdist to specify the configuration directory
-        CLOSED: [2020-05-04 월 23:58]
-******* DONE Use the -vv parameter to get more verbose output
-        CLOSED: [2020-05-04 월 23:57]
-******* DONE Search for / understand what MOTD stands for
-        CLOSED: [2020-05-05 화 00:41]
-****** DONE Configure cdist to create the file /etc/cdist-configured
-       CLOSED: [2020-05-04 월 23:33]
-****** DONE Configure cdist to setup the timezone on your local computer
-       CLOSED: [2020-05-04 월 23:33]
-****** DONE Configure cdist to ensure emacs is installed
-       CLOSED: [2020-05-04 월 23:47]
-****** DONE Ensure that in the end all changes are committed in your repository
-       CLOSED: [2020-05-05 화 00:42]
+      - Checkout cdist quickstart https://www.cdi.st/manual/latest/cdist-quickstart.html
+      - Install cdist locally
+      - Create a new cdist configuration directory in ~/ungleich-learning-circle/USERNAME/dot-cdist
+      - Create an empty initial manifest ("use touch")
+      - Commit that status
+      - Ensure that you can login as root to localhost via ssh without a password
+      - Configure cdist to configures the motd of your localhost
+        - Ensure you have a case block matching on $__target_host
+        - Use the -c parameter to cdist to specify the configuration directory
+        - Use the -vv parameter to get more verbose output
+        - Search for / understand what MOTD stands for
+      - Configure cdist to create the file /etc/cdist-configured
+      - Configure cdist to setup the timezone on your local computer
+      - Configure cdist to ensure emacs is installed
+      - Ensure that in the end all changes are committed in your repository
 * 2020-05-01
 *** Organisation #5: Emacs refresher
 **** Lecture content
 ***** Objective: get confident with emacs commands
 ***** Find out and document how to do the following steps
-****** DONE Search for something forward C-s
-       CLOSED: [2020-05-01 금 21:40]
-****** DONE How to continue searching C-s C-s
-       CLOSED: [2020-05-01 금 21:43]
-****** DONE Search for something backward C-r
-       CLOSED: [2020-05-01 금 21:55]
-****** DONE Search for regular expressions instead of string (forward, backward) C-M-s C-M-r
-       CLOSED: [2020-05-01 금 22:25]
-****** DONE Go to the beginning of the line C-a
-       CLOSED: [2020-05-01 금 22:16]
-****** DONE Go to the end of the line C-e
-       CLOSED: [2020-05-01 금 22:16]
-****** DONE Delete a word in front (to the right of the cursor) M-d
-       CLOSED: [2020-05-01 금 22:17]
-****** DONE Delete a word in back (to the left of the cursor) M-BackSpace
-       CLOSED: [2020-05-01 금 22:18]
-****** DONE List all "occurences" of a word in a file M-s o
-       CLOSED: [2020-05-01 금 22:53]
-******* You can copy above instructions into an emacs buffer
-******* And test it by showing all occurences of the word "Search"
-****** DONE Search (GREP) for a word in all files in a directory RECURSIVELY M-x rgrep
-       CLOSED: [2020-05-01 금 22:46]
-****** DONE Save the CURRENT buffer C-x C-s
-       CLOSED: [2020-05-01 금 21:55]
-****** DONE Save ALL open files C-x-s
-       CLOSED: [2020-05-01 금 22:22]
-****** DONE Split the window/buffer vertically C-x 2
-       CLOSED: [2020-05-01 금 21:48]
-****** DONE Split the window/buffer horizontally C-x 3
-       CLOSED: [2020-05-01 금 21:48]
-****** DONE Switch between the different windows C-x o
-       CLOSED: [2020-05-01 금 21:48]
-****** DONE Close all buffers besides the active one C-x 1
-       CLOSED: [2020-05-01 금 21:47]
-******* Don't kill it!
-****** DONE Close only the active buffer C-x 0
-       CLOSED: [2020-05-01 금 21:54]
-******* Don't kill it!
-****** DONE Kill the active buffer C-x k
-       CLOSED: [2020-05-01 금 21:44]
-****** DONE Describe/Explain the difference between closing and killing
-       CLOSED: [2020-05-01 금 22:09]
-******* closing is that emac do not display the buffer. and the contents on the buffer are kept on behined screen.
-******* killing is that emac delete the buffer. and if contents are not stored, it is losted
-****** DONE Switch between buffers that are not shown C-x b
-       CLOSED: [2020-05-01 금 21:51]
-******* DONE Document two very similar, but slightly different ways
-	 CLOSED: [2020-05-01 금 23:28]
-******** C-x b is that the selected buffer is displayed on the focused window
-******** C-x C-b is that all buffers is dispalayed on the new window
-******** C-x 4 b is that the selected buffer is displayed on the new window
+      - Search for something forward C-s
+      - How to continue searching C-s C-s
+      - Search for something backward C-r
+      - Search for regular expressions instead of string (forward, backward) C-M-s C-M-r
+      - Go to the beginning of the line C-a
+      - Go to the end of the line C-e
+      - Delete a word in front (to the right of the cursor) M-d
+      - Delete a word in back (to the left of the cursor) M-BackSpace
+      - List all "occurences" of a word in a file M-s o
+        - You can copy above instructions into an emacs buffer
+        - And test it by showing all occurences of the word "Search"
+      - Search (GREP) for a word in all files in a directory RECURSIVELY M-x rgrep
+      - Save the CURRENT buffer C-x C-s
+      - Save ALL open files C-x-s
+      - Split the window/buffer vertically C-x 2
+      - Split the window/buffer horizontally C-x 3
+      - Switch between the different windows C-x o
+      - Close all buffers besides the active one C-x 1
+        - Don't kill it!
+      - Close only the active buffer C-x 0
+        -* Don't kill it!
+      - Kill the active buffer C-x k
+      - Describe/Explain the difference between closing and killing
+        - closing is that emac do not display the buffer. and the contents on the buffer are kept on behined screen.
+        - killing is that emac delete the buffer. and if contents are not stored, it is losted
+      - Switch between buffers that are not shown C-x b
+        - Document two very similar, but slightly different ways
+          - C-x b is that the selected buffer is displayed on the focused window
+          - C-x C-b is that all buffers is dispalayed on the new window
+          - C-x 4 b is that the selected buffer is displayed on the new window
 ***** Outcome
-****** DONE Document all above commands in your learning org sheet
-       CLOSED: [2020-05-01 금 23:28]
-****** DONE Share your documentation at the end of the session (not before)
-       CLOSED: [2020-05-01 금 23:28]
-
+      - Document all above commands in your learning org sheet
+      - Share your documentation at the end of the session (not before)
 * 2020-04-29
 *** Organisation #4: Organising yourself
 **** Lecture content
 ***** Objective: have a todo list based on org mode
 ***** Steps
-****** Configure the "org-directory" to be ~/ungleich-learning-circle/USERNAME/
-******* This is important as it will be used by the todo function later
-****** Extend your function from the organisation #1 session
-******* Instead of opening a fixed file, we include two variable parts:
-******** The hostname of the machine
-******** The year
-******* Pressing F3 should open ~/ungleich-learning-circle/USERNAME/learning-$(hostname)-$(year).org
-******** we call this "your personal agenda"
-****** Configure mu4e to create a org-mode tasks from an email
-******* Store these tasks in ~/ungleich-learning-circle/USERNAME/todo.org
-****** Configure emacs to open the "org-agenda" with "C-c a"
-****** List all TODO entries
-****** List the agenda of the day
-****** List the agenda of the week
-****** Bind F8 to open the "org-todo-list"
-****** Create some sample tasks in it
+      - Configure the "org-directory" to be ~/ungleich-learning-circle/USERNAME/
+        - This is important as it will be used by the todo function later
+      - Extend your function from the organisation #1 session
+        - Instead of opening a fixed file, we include two variable parts:
+          - The hostname of the machine
+          - The year
+        - Pressing F3 should open ~/ungleich-learning-circle/USERNAME/learning-$(hostname)-$(year).org
+          - we call this "your personal agenda"
+      - Configure mu4e to create a org-mode tasks from an email
+        - Store these tasks in ~/ungleich-learning-circle/USERNAME/todo.org
+      -  Configure emacs to open the "org-agenda" with "C-c a"
+      - List all TODO entries
+      - List the agenda of the day
+      - List the agenda of the week
+      - Bind F8 to open the "org-todo-list"
+      - Create some sample tasks in it
 ***** From now on, maintaining tasks should be
-****** Pressing F3 to open your personal "logfile"
-****** Adding a TODO item
-****** Pressing F8 to see the tasks with priorities
+      - Pressing F3 to open your personal "logfile"
+      - Adding a TODO item
+      - Pressing F8 to see the tasks with priorities
 ***** Bonus tasks
-****** Configure mu4e to store org-mode tasks in .../todo-$(hostname)-$(year).org
+      - Configure mu4e to store org-mode tasks in .../todo-$(hostname)-$(year).org
 * 2020-04-27
 *** Organisation #3: Managing your emails
 **** Lecture content
 ***** Objective
-****** Be able to manage all your mails in mu4e
+      - Be able to manage all your mails in mu4e
 ***** Description
-****** All email is synchronised using isync/mbsync
-****** Email is indexed with mu (xapian backend)
-****** Email is viewed in mu4e
-****** All new emails arrive in the inbox
+      - All email is synchronised using isync/mbsync
+      - Email is indexed with mu (xapian backend)
+      - Email is viewed in mu4e
+      - All new emails arrive in the inbox
 ***** Steps
-****** Install mu4e
-****** Start mu4e in emacs
-****** Configure mbsync for your ungleich mail account
-******* Synchronise all mails into ~/Maildir/ungleich
-******* This structure leaves room for other mail accounts, like ~/Maildir/gmail
-****** Verify that mbsync synchronises the mail
-****** Index mails using `mu` on the command line (only first time)
-****** Configure mu4e to get email with mbsync -a
-****** Configure mu4e to "archive" emails into ~/Maildir/ungleich/YEAR/
-******* This gives you a good performance / organisation for the next decades
-****** Configure mu4e/emacs for sending emails
-****** Send other participants an email via mu4e
-****** Verify that it arrives
-****** "Archive" it afterwards
+      - Install mu4e
+      - Start mu4e in emacs
+      - Configure mbsync for your ungleich mail account
+        - Synchronise all mails into ~/Maildir/ungleich
+        - This structure leaves room for other mail accounts, like ~/Maildir/gmail
+      - Verify that mbsync synchronises the mail
+      - Index mails using `mu` on the command line (only first time)
+      - Configure mu4e to get email with mbsync -a
+      - Configure mu4e to "archive" emails into ~/Maildir/ungleich/YEAR/
+        - This gives you a good performance / organisation for the next decades
+      - Configure mu4e/emacs for sending emails
+      - Send other participants an email via mu4e
+      - Verify that it arrives
+      - "Archive" it afterwards
 * 2020-04-24
 *** Organisation #2: Creating, managing and sharing with "magit"
 **** Lecture content
 ***** Install "magit" for emacs
 ***** Bind C-x g to open magit-status in ~/.emacs
 ***** Create a new directory ~/ungleich-learning-circle/ (with emacs)
-****** Use C-h b in dired mode to find out how to
+      - Use C-h b in dired mode to find out how to
 ***** Create a sub directory ~/ungleich-learning-circle/YOURNAME/ (with emacs)
 ***** Move your previously created learning.org file into ~/ungleich-learning-circle/YOURNAME/ (with emacs)
 ***** Initialise it with git (with magit)
@@ -342,4 +319,4 @@
 ***** Create a function that opens ~/learning.org in your ~/.emacs
 ***** Bind that function to "f3" (configure it in .emacs)
 ***** Create a new item named "2020-04-10"
-****** Create a sub item "ungleich learning circle"
+      - Create a sub item "ungleich learning circle"
diff --git a/youngjin.han/python-the-hard-way/ex1.py b/youngjin.han/python-the-hard-way/ex1.py
new file mode 100644
index 0000000..0dc680f
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex1.py
@@ -0,0 +1,8 @@
+#print("Hello World!")
+print("Hello Again")
+print("I like typeing this.")
+print("This is fun")
+print('Yay! Printing.')
+print("I'd much rather you 'not'.")
+print('I "said" do not touch this.')
+print("Ungleich Cidst\n")
diff --git a/youngjin.han/python-the-hard-way/ex10.py b/youngjin.han/python-the-hard-way/ex10.py
new file mode 100644
index 0000000..a8395e7
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex10.py
@@ -0,0 +1,29 @@
+tabby_cat = "\tI'm tabbed in."
+persian_cat = "I'm split\non a line."
+backslash_cat = "I'm \\ a \\ cat."
+
+fat_cat = """
+I'll do a list:
+\t* Cat food
+\t* Fishies
+\t* Catnip\n\t* Grass
+"""
+
+fat_cat_single = '''
+I'll do a list:
+\t* Cat food
+\t* Fishies
+\t* Catnip\n\t* Grass
+'''
+
+new_test = """
+\t tap \a BELL \r CR \f FF
+\\ \u0032 \U00000033
+"""
+
+print(tabby_cat)
+print(persian_cat)
+print(backslash_cat)
+print(fat_cat)
+print(fat_cat_single)
+print(new_test)
diff --git a/youngjin.han/python-the-hard-way/ex11.py b/youngjin.han/python-the-hard-way/ex11.py
new file mode 100644
index 0000000..8392830
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex11.py
@@ -0,0 +1,12 @@
+#print("How old are you?", end=' ')
+#age = input()
+#print("How tall are you?", end=' ')
+#height = input()
+#print("How much do you weigh?", end=' ')
+#weight = input()
+
+age = input("How old are you?" ' ')
+height = input("How tall are you?" ' ')
+weight = input("How much do you weigh?" ' ')
+
+print(f"So, you're {age} old, {height} tall and {weight} heavy.")
diff --git a/youngjin.han/python-the-hard-way/ex12.py b/youngjin.han/python-the-hard-way/ex12.py
new file mode 100644
index 0000000..f1fcdd1
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex12.py
@@ -0,0 +1,5 @@
+age = input("How old are you? ")
+height = input("How tall are you? ")
+weight = input("How much do you weigh? ")
+
+print(f"So, you're {age} old, {height} tall and {weight} heavy.")
diff --git a/youngjin.han/python-the-hard-way/ex13.py b/youngjin.han/python-the-hard-way/ex13.py
new file mode 100644
index 0000000..56bc8fa
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex13.py
@@ -0,0 +1,9 @@
+from sys import argv
+# read the WYSS section for how to run this
+script, first, second, third, fourth = argv
+
+print("The script is called:", script)
+print("Your first variable is:", first)
+print("Your second variable is:", second)
+print("Your third variable is:", third)
+print("Your fourth variable is:", fourth)
diff --git a/youngjin.han/python-the-hard-way/ex14.py b/youngjin.han/python-the-hard-way/ex14.py
new file mode 100644
index 0000000..9f277ec
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex14.py
@@ -0,0 +1,22 @@
+from sys import argv
+
+script, user_name, age = argv
+prompt = '$ '
+
+print(f"Hi {user_name}, I'm the {script} script.")
+print("I'd like to ask you a few questions.")
+print(f"Do you like me {user_name}?")
+likes = input(prompt)
+
+print(f"Where do you live {user_name}?")
+lives = input(prompt)
+
+print("What kind of computer do you have?")
+computer = input(prompt)
+
+print(f"""
+Alright, so you said {likes} about liking me.
+You live in {lives}. Not sure where that is.
+And you have a {computer} computer. Nice.
+Opps, You are {age} years old.
+""")
diff --git a/youngjin.han/python-the-hard-way/ex2.py b/youngjin.han/python-the-hard-way/ex2.py
new file mode 100644
index 0000000..6f3b06c
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex2.py
@@ -0,0 +1,9 @@
+# A comment, this is so you can read your program later.
+# Anything after the # is ignored by python.
+
+print("I could have code like this.") # and the comment after is ignored
+
+# You can also use a comment to "disable" or comment out code:
+# print("This won't run.")
+
+print("This will run.")
diff --git a/youngjin.han/python-the-hard-way/ex3-1.py b/youngjin.han/python-the-hard-way/ex3-1.py
new file mode 100644
index 0000000..b661883
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex3-1.py
@@ -0,0 +1,9 @@
+f_pi = 3.14159265358979
+
+print("org =", f_pi)
+print("trans format 1 = %.2f" % f_pi)
+print("trans format 2 =", round(f_pi, 2))
+print("trans format 3 = %.2f" % round(f_pi, 2))
+print("trans format 4 = {:.2f}".format(f_pi))
+print("trans format 5 = {:.2f}".format(round(f_pi, 2)))
+print("trans format 6 = {:.15f}".format(round(f_pi, 2)))
diff --git a/youngjin.han/python-the-hard-way/ex3-2.py b/youngjin.han/python-the-hard-way/ex3-2.py
new file mode 100644
index 0000000..dd88dfd
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex3-2.py
@@ -0,0 +1,4 @@
+print((2**8) - 1)
+print((2**16) - 1)
+print((2**32) - 1)
+print((2**64) - 1)
diff --git a/youngjin.han/python-the-hard-way/ex3.py b/youngjin.han/python-the-hard-way/ex3.py
new file mode 100644
index 0000000..5f44bfe
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex3.py
@@ -0,0 +1,23 @@
+print("I will now count my chickens:")
+
+print("Hens", 25 + 30 / 6) # 25 + (30 / 6) = 25 + 5 = 30
+
+print("Roosters", 100 - 25 * 3 % 4) # 100 - (25 * 3 % 4) = 100 - (75 % 4) = 100 - 3 = 97
+print("Now I will count the eggs:") # print syntex
+
+print(3 + 2 + 1 - 5 + 4 % 2 - 1 / 4 + 6) # 3 + 2 + 1 - 5 + 0 - 0.25 + 6 = 6.75
+
+print("Is it true that 3 + 2 < 5 - 7?") # print syntex
+
+print(3 + 2 < 5 - 7) # 5 < -2 => false
+
+print("What is 3 + 2?", 3 + 2) # 5
+print("What is 5 - 7?", 5 - 7) # -2
+
+print("Oh, that's why it's False.") # print syntex
+
+print("How about some more.") # print syntex
+
+print("Is it greater?", 5 > -2) # true
+print("Is it greater or equal?", 5 >= -2) # true
+print("Is it less or equal?", 5 <= -2) # false
diff --git a/youngjin.han/python-the-hard-way/ex4.py b/youngjin.han/python-the-hard-way/ex4.py
new file mode 100644
index 0000000..203574b
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex4.py
@@ -0,0 +1,17 @@
+cars = 100 # amount of car
+space_in_a_car = 4.0 # amount of seats in the car
+drivers = 30 # amount of driver
+passengers = 90 # amount of passenger
+cars_not_driven = cars - drivers # amount of person which could not drive = 70
+cars_driven = drivers # amount of person which could drive = 30
+carpool_capacity = cars_driven * space_in_a_car # amount of seat for carpool = 120
+average_passengers_per_car = passengers / cars_driven # 3
+
+
+print("There are", cars, "cars available.")
+print("There are only", drivers, "drivers available.")
+print("There will be", cars_not_driven, "empty cars today.")
+print("We can transport", carpool_capacity, "people today.")
+print("We have", passengers, "to carpool today.")
+print("We need to put about", average_passengers_per_car,
+         "in each car.")
diff --git a/youngjin.han/python-the-hard-way/ex5.py b/youngjin.han/python-the-hard-way/ex5.py
new file mode 100644
index 0000000..d38c795
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex5.py
@@ -0,0 +1,24 @@
+name = 'Zed A. Shaw'
+age = 35 # not a lie
+height = 74 # inches
+weight = 180 # lbs
+eyes = 'Blue'
+teeth = 'White'
+hair = 'Brown'
+
+inch_to_cm = 2.54
+lbs_to_kg = 0.45359237
+
+cm_height = height * inch_to_cm
+kg_weight = weight * lbs_to_kg
+
+print(f"Let's talk about {name}.")
+print(f"He's {height} inches or {cm_height} cm tall. ")
+print(f"He's {weight} pounds or {kg_weight} kg heavy.")
+print("Actually that's not too heavy.")
+print(f"He's got {eyes} eyes and {hair} hair.")
+print(f"His teeth are usually {teeth} depending on the coffee.")
+
+# this line is tricky, try to get it exactly right
+total = age + height + weight
+print(f"If I add {age}, {height}, and {weight} I get {total}.")
diff --git a/youngjin.han/python-the-hard-way/ex6.py b/youngjin.han/python-the-hard-way/ex6.py
new file mode 100644
index 0000000..d086426
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex6.py
@@ -0,0 +1,23 @@
+types_of_people = 10 # define a value
+x = f"There are {types_of_people} types of people." # define a string with the value "types_of_people"
+
+binary = "binary" # define a string
+do_not = "don't" # define a string
+y = f"Those who know {binary} and those who {do_not}." # define a string with two string array
+
+print(x) # print "There are 10 types of people."
+print(y) # print "Those who know binary and those who don't."
+
+print(f"I said: {x}") # print "I said: There are 10 types of people."
+print(f"I also said: '{y}'") # print "I also said: 'Those who know binary and those who don't.'"
+
+hilarious = False # define a value
+
+joke_evaluation = "Isn't that joke so funny?! {}" # define a string
+
+print(joke_evaluation.format(hilarious)) # print some format string
+
+w = "This is the left side of..." # define a value
+e = "a string with a right side." # define a value
+
+print(w + e) # print a 
diff --git a/youngjin.han/python-the-hard-way/ex7.py b/youngjin.han/python-the-hard-way/ex7.py
new file mode 100644
index 0000000..d7099f3
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex7.py
@@ -0,0 +1,21 @@
+print("Mary had a little lamb.") # print scipts
+print("Its fleece was white as {}.".format('snow')) # print scipts
+print("And everywhere that Mary went.") # print scipts
+print("." * 10) # what'd that do? # print dot 10 times
+
+end1 = "C" # define a character
+end2 = "h" # define a character
+end3 = "e" # define a character
+end4 = "e" # define a character
+end5 = "s" # define a character
+end6 = "e" # define a character
+end7 = "B" # define a character
+end8 = "u" # define a character
+end9 = "r" # define a character
+end10 = "g" # define a character
+end11 = "e" # define a character
+end12 = "r" # define a character
+
+# watch end = ' ' at the end. try removing it to see what happens
+print(end1 + end2 + end3 + end4 + end5 + end6, end=' ') # print "Cheese "
+print(end7 + end8 + end9 + end10 + end11 + end12) # print "Burger"
diff --git a/youngjin.han/python-the-hard-way/ex8.py b/youngjin.han/python-the-hard-way/ex8.py
new file mode 100644
index 0000000..6019f00
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex8.py
@@ -0,0 +1,12 @@
+formatter = "{} {} {} {}"
+
+print(formatter.format(1, 2, 3, 4))
+print(formatter.format("one", "two", "three", "four"))
+print(formatter.format(True, False, False, True))
+print(formatter.format(formatter, formatter, formatter, formatter))
+print(formatter.format(
+    "Try your",
+    "Own text here",
+    "Maybe a poem",
+    "Or a song about fear"
+))
diff --git a/youngjin.han/python-the-hard-way/ex9.py b/youngjin.han/python-the-hard-way/ex9.py
new file mode 100644
index 0000000..056db3b
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex9.py
@@ -0,0 +1,14 @@
+# Here's some new strange stuff, remember type it exactly.
+
+days = "Mon Tue Wed Thu Fri Sat Sun" # define a string
+months = "Jan\nFeb\nMar\nApr\nMay\nJun\nJul\nAug" # define a string
+
+print("Here are the days: ", days) # print the days in a week
+print("Here are the months: ", months) # print the months in a year with new lines
+
+print("""
+There's something going on here.
+With the three double-quotes.
+We'll be able to type as much as we like.
+Even 4 lines if we want, or 5, or 6.
+""") # print multiple lines with three double-quotes
diff --git a/youngjin.han/python.org b/youngjin.han/python.org
new file mode 100644
index 0000000..e13dc10
--- /dev/null
+++ b/youngjin.han/python.org
@@ -0,0 +1,34 @@
+* 2020-05-20
+** note
+   - ex8.py
+     - none
+   - ex9.py
+     - none
+   - ex10.py
+     - none
+   - ex11.py
+     - none
+   - ex12.py
+     - pydoc input
+       - describe input on python. It looks like man commnad on linux shell.
+   - ex13.py
+     - none
+   - ex14.py
+     - none
+
+* 2020-05-18
+** note
+   - ex1.py
+     - # is commnet.
+   - ex2.py
+     - I do't find mistakes.
+   - ex3.py
+     - none
+   - ex4.py
+     - car_pool_capacity is not defined.
+   - ex5.py
+     - none
+   - ex6.py
+     - + is to add two string array.
+   - ex7.py
+     - none