From 6296a5b75328e017ea685c67d95c9c255d0b3751 Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Wed, 20 May 2020 21:16:04 +0900
Subject: [PATCH 01/16] [Python #2] create ex8.py

---
 kjg/python-the-hard-way/e8.py | 11 +++++++++++
 kjg/python.org                |  3 +++
 kjg/python.org~               | 19 -------------------
 3 files changed, 14 insertions(+), 19 deletions(-)
 create mode 100644 kjg/python-the-hard-way/e8.py
 delete mode 100644 kjg/python.org~

diff --git a/kjg/python-the-hard-way/e8.py b/kjg/python-the-hard-way/e8.py
new file mode 100644
index 0000000..51adf35
--- /dev/null
+++ b/kjg/python-the-hard-way/e8.py
@@ -0,0 +1,11 @@
+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/kjg/python.org b/kjg/python.org
index 9cada1d..370d8d3 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -66,3 +66,6 @@ Its fleece was white as snow.
 And everywhere that Mary went.
 ..........
 Cheese Burger
+*** Python #2:
+**** ex8
+learn about a more complicated formatting of a string. {}
diff --git a/kjg/python.org~ b/kjg/python.org~
deleted file mode 100644
index 13d37bc..0000000
--- a/kjg/python.org~
+++ /dev/null
@@ -1,19 +0,0 @@
-*python
-
-*** Python #1:
-**** ex0
-**** ex1
->>> print("Hello World!")
-... print("Hello Again")
-... print("I like typing this.")
-... print("This is fun.")
-... print('Yay! Printing.')
-... print("I'd much rather you 'not'.")
-... print('I "said" do not touch this.')
-Hello World!
-Hello Again
-I like typing this.
-This is fun.
-Yay! Printing.
-I'd much rather you 'not'.
-I "said" do not touch this.

From 4a11b015203426e803f66e6ad11d1da1477b0dc6 Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Wed, 20 May 2020 21:31:00 +0900
Subject: [PATCH 02/16] [Python #2] create e9.py

---
 kjg/python-the-hard-way/e9.py | 14 ++++++++++++++
 kjg/python.org                |  2 ++
 2 files changed, 16 insertions(+)
 create mode 100644 kjg/python-the-hard-way/e9.py

diff --git a/kjg/python-the-hard-way/e9.py b/kjg/python-the-hard-way/e9.py
new file mode 100644
index 0000000..b9be9f6
--- /dev/null
+++ b/kjg/python-the-hard-way/e9.py
@@ -0,0 +1,14 @@
+# Here's some new strange stuff, remember type it exactly
+
+days = "Mon Tue Wed Thu Fri Sat Sun"
+months = "Jan\nFeb\nMar\nApr\nMay\nJun\nJul\nAug"
+
+print("Here are the days: ", days)
+print("Here are the months: ", months)
+
+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
+      """)
diff --git a/kjg/python.org b/kjg/python.org
index 370d8d3..13a8b64 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -69,3 +69,5 @@ Cheese Burger
 *** Python #2:
 **** ex8
 learn about a more complicated formatting of a string. {}
+**** ex9
+how to print for multiline or nextline

From 63052676fc9f60d30e17e0431753ea276243cd9a Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Wed, 20 May 2020 21:46:08 +0900
Subject: [PATCH 03/16] [Python #2] create e10.py

---
 kjg/python-the-hard-way/e10.py | 16 ++++++++++++++++
 kjg/python.org                 |  2 ++
 2 files changed, 18 insertions(+)
 create mode 100644 kjg/python-the-hard-way/e10.py

diff --git a/kjg/python-the-hard-way/e10.py b/kjg/python-the-hard-way/e10.py
new file mode 100644
index 0000000..fe56c91
--- /dev/null
+++ b/kjg/python-the-hard-way/e10.py
@@ -0,0 +1,16 @@
+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
+'''
+
+print(tabby_cat)
+print(persian_cat)
+print(backslash_cat)
+print(fat_cat)
+print("\u1234")
diff --git a/kjg/python.org b/kjg/python.org
index 13a8b64..5a6d49f 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -71,3 +71,5 @@ Cheese Burger
 learn about a more complicated formatting of a string. {}
 **** ex9
 how to print for multiline or nextline
+**** ex10
+how to use \ (using special chracter)

From 65f0d43cfa7fa23ac55bb3e73d58bebb7f8c3f5b Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Wed, 20 May 2020 21:55:04 +0900
Subject: [PATCH 04/16] [Python #2] create e11.py

---
 kjg/python-the-hard-way/e11.py | 8 ++++++++
 kjg/python.org                 | 3 +++
 2 files changed, 11 insertions(+)
 create mode 100644 kjg/python-the-hard-way/e11.py

diff --git a/kjg/python-the-hard-way/e11.py b/kjg/python-the-hard-way/e11.py
new file mode 100644
index 0000000..253a825
--- /dev/null
+++ b/kjg/python-the-hard-way/e11.py
@@ -0,0 +1,8 @@
+print("How old are you?", end=' ')
+age = input()
+print("How tall are you?", end=' ')
+height = input()
+print("How much do you weight?", end=' ')
+weight = input()
+
+print(f"So, you're {age} old, {height} tall and {weight} heavy.")
diff --git a/kjg/python.org b/kjg/python.org
index 5a6d49f..d3f5fd1 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -73,3 +73,6 @@ learn about a more complicated formatting of a string. {}
 how to print for multiline or nextline
 **** ex10
 how to use \ (using special chracter)
+**** ex11
+how to use key input
+

From e43b6d8ebc759488e0b995e643f113aa26576600 Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Wed, 20 May 2020 22:12:47 +0900
Subject: [PATCH 05/16] [Python #2] create e12.py

---
 kjg/python-the-hard-way/e12.py | 5 +++++
 kjg/python.org                 | 3 ++-
 2 files changed, 7 insertions(+), 1 deletion(-)
 create mode 100644 kjg/python-the-hard-way/e12.py

diff --git a/kjg/python-the-hard-way/e12.py b/kjg/python-the-hard-way/e12.py
new file mode 100644
index 0000000..16e6920
--- /dev/null
+++ b/kjg/python-the-hard-way/e12.py
@@ -0,0 +1,5 @@
+age = input("How old are you? ")
+height = input("How tall are you? ")
+weight = input("How much do you weight? ")
+
+print(f"So, you're {age} old, {height} tall and {weight} heavy.")
diff --git a/kjg/python.org b/kjg/python.org
index d3f5fd1..64a4a71 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -75,4 +75,5 @@ how to print for multiline or nextline
 how to use \ (using special chracter)
 **** ex11
 how to use key input
-
+**** ex12
+how to use key input with print

From adfc2fe765fa73edfd07b2bcf30efa16e3e435ca Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Wed, 20 May 2020 22:37:15 +0900
Subject: [PATCH 06/16] [Python #2] create e13.py

---
 kjg/python-the-hard-way/e13.py | 8 ++++++++
 kjg/python.org                 | 2 ++
 2 files changed, 10 insertions(+)
 create mode 100644 kjg/python-the-hard-way/e13.py

diff --git a/kjg/python-the-hard-way/e13.py b/kjg/python-the-hard-way/e13.py
new file mode 100644
index 0000000..f8b7fe8
--- /dev/null
+++ b/kjg/python-the-hard-way/e13.py
@@ -0,0 +1,8 @@
+from sys import argv
+# read the WYSS section for how to run this
+script, first, second, third = 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)
diff --git a/kjg/python.org b/kjg/python.org
index 64a4a71..8ef9d17 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -77,3 +77,5 @@ how to use \ (using special chracter)
 how to use key input
 **** ex12
 how to use key input with print
+**** ex13
+how to use an argument when you run script

From 5b5bfe07ca5ecc851d1fb10abbb931012372c2d2 Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Wed, 20 May 2020 22:52:18 +0900
Subject: [PATCH 07/16] [Python #2] create e14.py

---
 kjg/python-the-hard-way/e14.py | 23 +++++++++++++++++++++++
 kjg/python.org                 |  2 ++
 2 files changed, 25 insertions(+)
 create mode 100644 kjg/python-the-hard-way/e14.py

diff --git a/kjg/python-the-hard-way/e14.py b/kjg/python-the-hard-way/e14.py
new file mode 100644
index 0000000..74bcd95
--- /dev/null
+++ b/kjg/python-the-hard-way/e14.py
@@ -0,0 +1,23 @@
+from sys import argv
+
+script, user_name, first, second  = 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(f"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 suer where that is.
+And you have a {computer} computer. Nice.
+{first} and {second}
+""")
+
diff --git a/kjg/python.org b/kjg/python.org
index 8ef9d17..dffd17d 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -79,3 +79,5 @@ how to use key input
 how to use key input with print
 **** ex13
 how to use an argument when you run script
+**** ex14
+how to use an argument with input

From 8be2fe479d0c142436465854fb88be90ed1f163c Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Fri, 22 May 2020 21:19:18 +0900
Subject: [PATCH 08/16] [Python #2] create e15.py

---
 kjg/python-the-hard-way/e15.py          | 19 +++++++++++++++++++
 kjg/python-the-hard-way/ex15_sample.txt |  3 +++
 kjg/python.org                          |  3 +++
 3 files changed, 25 insertions(+)
 create mode 100644 kjg/python-the-hard-way/e15.py
 create mode 100644 kjg/python-the-hard-way/ex15_sample.txt

diff --git a/kjg/python-the-hard-way/e15.py b/kjg/python-the-hard-way/e15.py
new file mode 100644
index 0000000..c02e04e
--- /dev/null
+++ b/kjg/python-the-hard-way/e15.py
@@ -0,0 +1,19 @@
+from sys import argv
+
+script, filename = argv
+
+txt = open(filename)
+
+
+print(f"Here's your file {filename}: ")
+print(txt.read())
+
+txt.close()
+
+print("Type the filename again : ")
+file_again = input("> ")
+
+txt_again = open(file_again)
+
+print(txt_again.read())
+
diff --git a/kjg/python-the-hard-way/ex15_sample.txt b/kjg/python-the-hard-way/ex15_sample.txt
new file mode 100644
index 0000000..8719939
--- /dev/null
+++ b/kjg/python-the-hard-way/ex15_sample.txt
@@ -0,0 +1,3 @@
+This is stuff I typed into a file.
+It is really cool stuff .
+Lots and lots of fun to have in here.
diff --git a/kjg/python.org b/kjg/python.org
index dffd17d..cf4f9ff 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -81,3 +81,6 @@ how to use key input with print
 how to use an argument when you run script
 **** ex14
 how to use an argument with input
+*** Python #3:
+**** ex15
+How to use read function from file

From 2af966bd8625ce1937ae581a0984e07700962d43 Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Fri, 22 May 2020 21:39:59 +0900
Subject: [PATCH 09/16] [Python #3] create e16.py

---
 kjg/python-the-hard-way/e16.py   | 33 ++++++++++++++++++++++++++++++++
 kjg/python-the-hard-way/test.txt |  3 +++
 kjg/python.org                   |  2 ++
 3 files changed, 38 insertions(+)
 create mode 100644 kjg/python-the-hard-way/e16.py
 create mode 100644 kjg/python-the-hard-way/test.txt

diff --git a/kjg/python-the-hard-way/e16.py b/kjg/python-the-hard-way/e16.py
new file mode 100644
index 0000000..f8d3aaa
--- /dev/null
+++ b/kjg/python-the-hard-way/e16.py
@@ -0,0 +1,33 @@
+from sys import argv
+
+script, filename = argv
+
+print(f"We're going to erase {filename}.")
+print("If you don't want that, hit CTRL-C (^C).")
+print("If you do want that, hit RETURN.")
+
+input("?")
+
+print("Opening th file...")
+target = open(filename, 'w')
+
+print("Truncating the file. Goodbye!")
+target.truncate()
+
+print("Now I'm going to ask you for three lines.")
+
+line1 = input("line 1: ")
+line2 = input("line 2: ")
+line3 = input("line 3: ")
+
+print("I'm going to write these to the file.")
+
+target.write(line1)
+target.write("\n")
+target.write(line2)
+target.write("\n")
+target.write(line3)
+target.write("\n")
+
+print("And finally, we close it.")
+target.close()
diff --git a/kjg/python-the-hard-way/test.txt b/kjg/python-the-hard-way/test.txt
new file mode 100644
index 0000000..e3188be
--- /dev/null
+++ b/kjg/python-the-hard-way/test.txt
@@ -0,0 +1,3 @@
+Mary had a little lamb
+Its fleece was white as snow
+It was also tasty
diff --git a/kjg/python.org b/kjg/python.org
index cf4f9ff..312eb04 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -84,3 +84,5 @@ how to use an argument with input
 *** Python #3:
 **** ex15
 How to use read function from file
+**** ex16
+How to use write file

From 4e9f2a33d78a07bb09ddb33a5a40bb3d4646f0b1 Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Fri, 22 May 2020 21:54:30 +0900
Subject: [PATCH 10/16] [Python #3] create e17.py

---
 kjg/python-the-hard-way/e17.py       | 24 ++++++++++++++++++++++++
 kjg/python-the-hard-way/new_file.txt |  1 +
 kjg/python-the-hard-way/test.txt     |  4 +---
 kjg/python.org                       |  4 +++-
 4 files changed, 29 insertions(+), 4 deletions(-)
 create mode 100644 kjg/python-the-hard-way/e17.py
 create mode 100644 kjg/python-the-hard-way/new_file.txt

diff --git a/kjg/python-the-hard-way/e17.py b/kjg/python-the-hard-way/e17.py
new file mode 100644
index 0000000..cfe8e16
--- /dev/null
+++ b/kjg/python-the-hard-way/e17.py
@@ -0,0 +1,24 @@
+from sys import argv
+from os.path import exists
+
+script, from_file, to_file = argv
+
+print(f"Copying from {from_file} to {to_file}")
+
+# we could do these two on one line, how ?
+in_file = open(from_file)
+indata = in_file.read()
+
+print(f"The input file is {len(indata)} bytes long")
+
+print(f"Does the output file exist? {exists(to_file)}")
+print("Ready, hit RETURN to continue, CTRL-C to abort.")
+input()
+
+out_file = open(to_file, 'w')
+out_file.write(indata)
+
+print("Alright, all done.")
+
+out_file.close()
+in_file.close()
diff --git a/kjg/python-the-hard-way/new_file.txt b/kjg/python-the-hard-way/new_file.txt
new file mode 100644
index 0000000..6de7b8c
--- /dev/null
+++ b/kjg/python-the-hard-way/new_file.txt
@@ -0,0 +1 @@
+This is a test file.
diff --git a/kjg/python-the-hard-way/test.txt b/kjg/python-the-hard-way/test.txt
index e3188be..6de7b8c 100644
--- a/kjg/python-the-hard-way/test.txt
+++ b/kjg/python-the-hard-way/test.txt
@@ -1,3 +1 @@
-Mary had a little lamb
-Its fleece was white as snow
-It was also tasty
+This is a test file.
diff --git a/kjg/python.org b/kjg/python.org
index 312eb04..f2a91e2 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -85,4 +85,6 @@ how to use an argument with input
 **** ex15
 How to use read function from file
 **** ex16
-How to use write file
+How to write file
+**** ex17
+How to copy file

From 8d83c50d5978ac9d55f4a534bf05a17865918d9c Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Fri, 22 May 2020 22:08:40 +0900
Subject: [PATCH 11/16] [Python #3] create e18.py

---
 kjg/python-the-hard-way/e18.py | 21 +++++++++++++++++++++
 kjg/python.org                 |  2 ++
 2 files changed, 23 insertions(+)
 create mode 100644 kjg/python-the-hard-way/e18.py

diff --git a/kjg/python-the-hard-way/e18.py b/kjg/python-the-hard-way/e18.py
new file mode 100644
index 0000000..0eb6184
--- /dev/null
+++ b/kjg/python-the-hard-way/e18.py
@@ -0,0 +1,21 @@
+# this one is like your scripts wih argv
+def print_two(*args):
+    arg1, arg2 = args
+    print(f"arg1: {arg1}, arg2; {arg2}")
+
+# ok, that *arg is actually pintless, we can just do this
+def print_two_again(arg1, arg2):
+    print(f"arg1: {arg1}, arg2: {arg2}")
+
+# this just takes one argument
+def print_one(arg1):
+    print(f"arg1: {arg1}")
+
+# this one takes no argument
+def print_none():
+    print("I got nothing.")
+
+print_two("Zed","Shaw")
+print_two_again("Zed","Shaw")
+print_one("First!")
+print_none()
diff --git a/kjg/python.org b/kjg/python.org
index f2a91e2..6e95efe 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -88,3 +88,5 @@ How to use read function from file
 How to write file
 **** ex17
 How to copy file
+**** ex18
+How to use function

From fad98b2be3a6508df5b2848c7a26cd45fdbd2b1d Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Fri, 22 May 2020 22:32:42 +0900
Subject: [PATCH 12/16] [Python #3] create e19.py

---
 kjg/python-the-hard-way/e19.py | 20 ++++++++++++++++++++
 kjg/python.org                 |  2 ++
 2 files changed, 22 insertions(+)
 create mode 100644 kjg/python-the-hard-way/e19.py

diff --git a/kjg/python-the-hard-way/e19.py b/kjg/python-the-hard-way/e19.py
new file mode 100644
index 0000000..18d9d54
--- /dev/null
+++ b/kjg/python-the-hard-way/e19.py
@@ -0,0 +1,20 @@
+def cheese_and_crackers(cheese_count, boxes_of_crackers):
+    print(f"You have {cheese_count} cheeses!")
+    print(f"You have {boxes_of_crackers} boxes_of_crackers!")
+    print("Man that's enough for a party!")
+    print("Get a blanket.\n")
+    
+print("We can just give the function numbers directly:")
+cheese_and_crackers(20, 30)
+
+print("OR, we can use variables from our script:")
+amount_of_cheese = 10
+amount_of_crackers = 50
+
+cheese_and_crackers(amount_of_cheese, amount_of_crackers)
+
+print("We can even do math inside too:")
+cheese_and_crackers(10 + 20, 5 + 6)
+
+print("And we can combine the two, variables and math:")
+cheese_and_crackers(amount_of_cheese + 100, amount_of_crackers + 1000)
diff --git a/kjg/python.org b/kjg/python.org
index 6e95efe..57a1a0d 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -90,3 +90,5 @@ How to write file
 How to copy file
 **** ex18
 How to use function
+**** ex19
+How to use function and variables

From 991779bc672bb25bc290cf55a03e8a13bb51f294 Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Fri, 22 May 2020 22:49:51 +0900
Subject: [PATCH 13/16] [Python #3] create e20.py

---
 kjg/python-the-hard-way/e20.py   | 35 ++++++++++++++++++++++++++++++++
 kjg/python-the-hard-way/test.txt |  4 +++-
 kjg/python.org                   |  2 ++
 3 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 kjg/python-the-hard-way/e20.py

diff --git a/kjg/python-the-hard-way/e20.py b/kjg/python-the-hard-way/e20.py
new file mode 100644
index 0000000..8f7cee7
--- /dev/null
+++ b/kjg/python-the-hard-way/e20.py
@@ -0,0 +1,35 @@
+from sys import argv
+
+script, input_file = argv
+
+def print_all(f):
+    print(f.read())
+
+def rewind(f):
+    f.seek(0)
+
+def print_a_line(line_count, f):
+    print(line_count, f.readline())
+
+current_file = open(input_file)
+
+print("First let's print the whole file: \n")
+
+print_all(current_file)
+
+print("Now let's rewind, kind of like a tape.")
+
+rewind(current_file)
+
+print("Let's print three lines:")
+
+current_line = 1
+print_a_line(current_line, current_file)
+
+#current_line = current_line + 1
+current_line += 1
+print_a_line(current_line, current_file)
+
+#current_line = current_line + 1
+current_line += 1
+print_a_line(current_line, current_file)
diff --git a/kjg/python-the-hard-way/test.txt b/kjg/python-the-hard-way/test.txt
index 6de7b8c..e97bf0c 100644
--- a/kjg/python-the-hard-way/test.txt
+++ b/kjg/python-the-hard-way/test.txt
@@ -1 +1,3 @@
-This is a test file.
+This is line 1
+This is line 2
+This is line 3
diff --git a/kjg/python.org b/kjg/python.org
index 57a1a0d..aa4fc79 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -92,3 +92,5 @@ How to copy file
 How to use function
 **** ex19
 How to use function and variables
+**** ex20
+How to use function with file

From ac073078550ac18d144a5e3fc55c3a1cd6c8db1b Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Fri, 22 May 2020 23:14:40 +0900
Subject: [PATCH 14/16] [Python #3] create e20.py

---
 kjg/python-the-hard-way/e21.py | 40 ++++++++++++++++++++++++++++++++++
 kjg/python.org                 |  2 ++
 2 files changed, 42 insertions(+)
 create mode 100644 kjg/python-the-hard-way/e21.py

diff --git a/kjg/python-the-hard-way/e21.py b/kjg/python-the-hard-way/e21.py
new file mode 100644
index 0000000..a72984f
--- /dev/null
+++ b/kjg/python-the-hard-way/e21.py
@@ -0,0 +1,40 @@
+def add(a, b):
+    print(f"ADDING {a} + {b}")
+    return a + b
+
+
+def subtract(a, b):
+    print(f"SUBTRACTING {a} - {b}")
+    return a - b
+
+
+def multiplay(a, b):
+    print(f"MULTIPLYING {a} * {b}")
+    return a * b
+
+
+def divide(a, b):
+    print(f"DIVIDING {a} / {b}")
+    return a / b
+
+
+print("Let's do some math with just functions!")
+
+age = add(30, 5)
+height = subtract(78, 4)
+weight = multiplay(90, 2)
+iq = divide(100, 2)
+
+print(f"Age: {age}, Height: {height}, Weight: {weight}, IQ: {iq}")
+
+# A puzzle for the extra credit, type it in anyway.
+print("Here is a puzzle.")
+
+what = add(age, subtract(height, multiplay(weight, divide(iq, 2))))
+
+print("That becomes: ", what, "Can you do it by hand?")
+
+
+
+
+
diff --git a/kjg/python.org b/kjg/python.org
index aa4fc79..48b693d 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -94,3 +94,5 @@ How to use function
 How to use function and variables
 **** ex20
 How to use function with file
+**** ex21
+How to use fucntion with return

From 45075b96b4336e46f4378551954fc0e8617fcf69 Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Fri, 22 May 2020 23:33:46 +0900
Subject: [PATCH 15/16] [Python #3] test ex22

---
 kjg/python-the-hard-way/e3.py         | 4 ++--
 kjg/python-the-hard-way/new_file2.txt | 3 +++
 kjg/python-the-hard-way/test.txt      | 6 +++---
 kjg/python.org                        | 2 ++
 4 files changed, 10 insertions(+), 5 deletions(-)
 create mode 100644 kjg/python-the-hard-way/new_file2.txt

diff --git a/kjg/python-the-hard-way/e3.py b/kjg/python-the-hard-way/e3.py
index e7067be..f7e9ac9 100644
--- a/kjg/python-the-hard-way/e3.py
+++ b/kjg/python-the-hard-way/e3.py
@@ -5,11 +5,11 @@ print("Roosters", 100 - 25  * 3 % 4 )
 
 print("Now I will count the eggs : ")
 
-print(3 + 2 + 1 - 5 + 4 % 2 -1 / 4 + 6)
+print(3 + 2 + 1 - 5 + 4 % 2 - 1 / 4 + 6)
 
 print("Is it true that 3 + 2 < 5 - 7?")
 
-print(3 + 2 < 5 -7 )
+print(3 + 2 < 5 - 7 )
 
 print("What is 3 + 2?", 3 + 2)
 print("What is 5 - 7?", 5 - 7)
diff --git a/kjg/python-the-hard-way/new_file2.txt b/kjg/python-the-hard-way/new_file2.txt
new file mode 100644
index 0000000..996a043
--- /dev/null
+++ b/kjg/python-the-hard-way/new_file2.txt
@@ -0,0 +1,3 @@
+test line1
+test line2
+test line3
diff --git a/kjg/python-the-hard-way/test.txt b/kjg/python-the-hard-way/test.txt
index e97bf0c..996a043 100644
--- a/kjg/python-the-hard-way/test.txt
+++ b/kjg/python-the-hard-way/test.txt
@@ -1,3 +1,3 @@
-This is line 1
-This is line 2
-This is line 3
+test line1
+test line2
+test line3
diff --git a/kjg/python.org b/kjg/python.org
index 48b693d..0656a8c 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -96,3 +96,5 @@ How to use function and variables
 How to use function with file
 **** ex21
 How to use fucntion with return
+**** ex22
+repeat from ex2 to ex21

From 87ad0c08427ae23f03fd8cb94dc2ead6d82deceb Mon Sep 17 00:00:00 2001
From: kjg <jinguk.kwon@ungleich.ch>
Date: Fri, 22 May 2020 23:43:18 +0900
Subject: [PATCH 16/16] [Python #3] update python.org for ex22

---
 kjg/python.org | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kjg/python.org b/kjg/python.org
index 0656a8c..d631490 100644
--- a/kjg/python.org
+++ b/kjg/python.org
@@ -97,4 +97,7 @@ How to use function with file
 **** ex21
 How to use fucntion with return
 **** ex22
-repeat from ex2 to ex21
+repeat from ex1 to ex21
+" # () ' + . < ? , = / % - * {} \n \t 
+open read close truncate def return print
+