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Add dictionary snippets and tutorial
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‎README.md

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@@ -7,3 +7,4 @@ Simple collection of various [Python](https://www.python.org/) Code snippets. F
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2. [How To Use Python Strings](https://vegibit.com/how-to-use-python-strings/)
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3. [How To Use Numbers In Python](https://vegibit.com/how-to-use-numbers-in-python/)
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4. [How To Use Python Lists](https://vegibit.com/how-to-use-python-lists/)
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5. [Python Dictionary Tutorial](https://vegibit.com/python-dictionary-tutorial/)

‎dictionary.py

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# A Python dictionary is a collection which is unordered, mutable, and indexed. In Python dictionaries
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# are written with curly brackets, and they have keys and values.
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# Making a dictionary
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player_0 = {'level': 'novice', 'points': 7}
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print(player_0['level'])
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# novice
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print(player_0['points'])
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# 7
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# Using the get() method to access a value
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player_0 = {'level': 'novice'}
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player_level = player_0.get('level')
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player_points = player_0.get('points', 0)
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print(player_level)
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# novice
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print(player_points)
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# 0
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# Dictionaries Inside Lists
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# Start with an empty list.
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profiles = []
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# Make a new profile, and add them to the list.
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new_profile = {
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'last': 'Diaz',
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'first': 'Guillermo',
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'profilename': 'gDiaz',
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}
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profiles.append(new_profile)
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# Make another new profile, and add them as well.
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new_profile = {
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'last': 'Rezende',
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'first': 'Pedro',
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'profilename': 'pRezende',
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}
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profiles.append(new_profile)
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# Show all information about each profile.
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for profile_dict in profiles:
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for k, v in profile_dict.items():
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print(f"{k}: {v}")
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print("\n")
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# last: Diaz
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# first: Guillermo
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# profilename: gDiaz
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# last: Rezende
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# first: Pedro
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# profilename: pRezende
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# Defining a list of dictionaries without using append()
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profiles = [
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{
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'last': 'Diaz',
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'first': 'Guillermo',
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'profilename': 'eDiaz',
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},
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{
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'last': 'Rezende',
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'first': 'Pedro',
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'profilename': 'mRezende',
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},
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]
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# Show all information about each profile.
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for profile_dict in profiles:
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for k, v in profile_dict.items():
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print(f"{k}: {v}")
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print("\n")
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# last: Diaz
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# first: Guillermo
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# profilename: eDiaz
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# last: Rezende
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# first: Pedro
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# profilename: mRezende
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# Adding a key-value pair
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player_0 = {'level': 'novice', 'points': 7}
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player_0['x'] = 0
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player_0['y'] = 25
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player_0['speed'] = 1.5
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# The above code may also be written as a dictionary literal like so.
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player_0 = {'level': 'novice', 'points': 7, 'x': 0, 'y': 25, 'speed': 1.5}
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# Adding to an empty dictionary
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player_0 = {}
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player_0['level'] = 'novice'
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player_0['points'] = 7
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# Modifying values in a dictionary
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# Change the player's level and point value.
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player_0['level'] = 'intermediate'
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player_0['points'] = 10
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print(player_0)
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# {'level': 'intermediate', 'points': 10}
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# Removing key-value pairs
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player_0 = {'level': 'novice', 'points': 7}
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del player_0['points']
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print(player_0)
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# {'level': 'novice'}
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# Storing lists in a dictionary
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fav_games = {
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'Pedro': ['Outer Wilds', 'Disco Elysium'],
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'Sean': ['Baba Is You'],
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'Daniel': ['Sekiro', 'Star Wars Jedi'],
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'Guillermo': ['Control', 'Dragon Quest Builders 2'],
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}
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# Show each name and associated games
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for name, games in fav_games.items():
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print(f"{name}: ")
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for game in games:
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print(f"- {game}")
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# Pedro:
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# - Outer Wilds
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# - Disco Elysium
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# Sean:
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# - Baba Is You
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# Daniel:
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# - Sekiro
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# - Star Wars Jedi
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# Guillermo:
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# - Control
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# - Dragon Quest Builders 2
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# Storing dictionaries in a dictionary
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profiles = {
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'smcloughlin': {
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'first': 'Sean',
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'last': 'McLoughlin',
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'gender': 'male',
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},
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'prezende': {
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'first': 'Pedro',
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'last': 'Rezende',
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'gender': 'male',
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},
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}
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for profilename, profile_dict in profiles.items():
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print("\nUsername: " + profilename)
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full_name = profile_dict['first'] + " "
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full_name += profile_dict['last']
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gender = profile_dict['gender']
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print(f"\tFull name: {full_name.title()}")
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print(f"\tgender: {gender.title()}")
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# Username: smcloughlin
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# Full name: Sean Mcloughlin
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# gender: Male
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# Username: prezende
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# Full name: Pedro Rezende
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# gender: Male
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# Looping through all key-value pairs
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# Store people's favorite games.
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fav_games = {
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'George': 'Crash Bandicoot',
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'Alex': 'Super Smash Bros',
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'Sarah': 'Legend Of Zelda',
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'Allison': 'Pong',
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}
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# Loop over key and value
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for name, game in fav_games.items():
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print(f"{name}: {game}")
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# George: Crash Bandicoot
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# Alex: Super Smash Bros
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# Sarah: Legend Of Zelda
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# Allison: Pong
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# Looping through all the keys
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for name in fav_games.keys():
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print(name)
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# George
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# Alex
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# Sarah
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# Allison
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# Looping through all the values
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for game in fav_games.values():
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print(game)
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# Crash Bandicoot
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# Super Smash Bros
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# Legend Of Zelda
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# Pong
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# Looping through all the keys in reverse order
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for name in sorted(fav_games.keys(), reverse=True):
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print(f"{name}: {fav_games[name]}")
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# Sarah: Legend Of Zelda
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# George: Crash Bandicoot
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# Allison: Pong
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# Alex: Super Smash Bros
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# Checking The Length Of A Dictionary
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num_responses = len(fav_games)
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print(num_responses)
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# 4
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# Using a loop to create a dictionary
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cubes = {}
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for x in range(5):
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cubes[x] = x ** 3
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print(cubes)
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# {0: 0, 1: 1, 2: 8, 3: 27, 4: 64}
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# Using a dictionary comprehension
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cubes = {x: x ** 3 for x in range(5)}
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print(cubes)
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# {0: 0, 1: 1, 2: 8, 3: 27, 4: 64}
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# Using zip() to make a dictionary
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veggies = ['pepper', 'broccoli', 'spinach', 'potato']
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fruits = ['apple', 'orange', 'peach', 'plum']
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combos = {key: key_2 for key, key_2 in zip(veggies, fruits)}
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print(combos)
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# {'pepper': 'apple', 'broccoli': 'orange', 'spinach': 'peach', 'potato': 'plum'}
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# To create a large number of dictionaries at once, you can use a loop like so.
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players = []
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# Make a thousand novice players, worth 3 points
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# each. Have them all start in one row.
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for player_num in range(1000):
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new_player = {}
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new_player['level'] = 'novice'
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new_player['points'] = 3
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new_player['x'] = 20 * player_num
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new_player['y'] = 0
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players.append(new_player)
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# Show the list contains a thousand players.
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num_players = len(players)
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print("Number of players created:")
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# Number of players created:
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print(num_players)
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# 1000

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