From 444dd20ea3c6137b6a8e0652c101877649d9650b Mon Sep 17 00:00:00 2001
From: Youngjin Han <youngjin.han@ungleich.ch>
Date: Mon, 8 Jun 2020 22:56:20 +0900
Subject: [PATCH] Learing Circle : python #8 - ex39

---
 youngjin.han/learning-node02-2020.org    |  3 +-
 youngjin.han/python-the-hard-way/ex39.py | 65 ++++++++++++++++++++++++
 youngjin.han/python.org                  |  2 +-
 3 files changed, 68 insertions(+), 2 deletions(-)
 create mode 100644 youngjin.han/python-the-hard-way/ex39.py

diff --git a/youngjin.han/learning-node02-2020.org b/youngjin.han/learning-node02-2020.org
index 7296fb2..d1fb94f 100644
--- a/youngjin.han/learning-node02-2020.org
+++ b/youngjin.han/learning-node02-2020.org
@@ -1,6 +1,7 @@
 * 2020-06-08
 *** Python #7:
-**** TODO Lecture content
+**** DONE Lecture content
+     CLOSED: [2020-06-08 월 22:49]
      - Same structure as "Python #2"
      - Exercises 37-39
 **** Lecture material
diff --git a/youngjin.han/python-the-hard-way/ex39.py b/youngjin.han/python-the-hard-way/ex39.py
new file mode 100644
index 0000000..f9bc7ed
--- /dev/null
+++ b/youngjin.han/python-the-hard-way/ex39.py
@@ -0,0 +1,65 @@
+# create a mapping of state to abbreviation
+states = {
+    'Oregon': 'OR',
+    'Florida': 'FL',
+    'California': 'CA',
+    'New York': 'NY',
+    'Michigan': 'MI',
+    'Texas': 'TX'
+}
+
+# create a basic set of states and some cities in them
+cities = {
+    'CA': 'San Francisco',
+    'MI': 'Detroit',
+    'FL': 'Jacksonville',
+    'Gyeonggi-do': 'Sungnam',
+    'Chungcheongbuk-do': 'Cheongju'
+}
+
+# add some more cities
+cities['NY'] = 'New York'
+cities['OR'] = 'Portland'
+cities['TX'] = 'Houston'
+
+# print out some cities
+print('-' * 10)
+print("NY State has: ", cities['NY'])
+print("OR State has: ", cities['OR'])
+
+# print some states
+print('-' * 10)
+print("Michigan's abbreviation is: ", states['Michigan'])
+print("Florida's abbreviation is: ", states['Florida'])
+
+# do it by using the state then cities dict
+print('-' * 10)
+print("Michigan has: ", cities[states['Michigan']])
+print("Florida has: ", cities[states['Florida']])
+
+# 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/youngjin.han/python.org b/youngjin.han/python.org
index fbb709d..af3b236 100644
--- a/youngjin.han/python.org
+++ b/youngjin.han/python.org
@@ -7,7 +7,7 @@
     - more_stuff.pop() == pop(more_stuff)
     - stuff.append(next_one) == append(stuff, next_one)
   - ex39.py
-    - 
+    - dictionaries do not use index number to search a key or a value.
 * 2020-05-29
 ** note
   - ex32.py