[Python #7] create e39.py

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}")
+
+

kjg/python.org

@@ -140,3 +140,5 @@ create calc.py
 analysis sample codes
 **** ex38
 append list
+**** ex39
+How to use dictionary