Kurssisisältö
Python Data Structures
Python Data Structures
1. Mastering Python Lists
Creating Lists in Python: Declaring and Initializing ListsList Indexing in Python: Accessing Elements EfficientlyWorking with Nested Lists in PythonPython List Length: Measuring and Managing List SizeModifying Lists in Python: Updating and Changing ElementsUsing the append() Method: Adding Elements to ListsUsing the insert() Method: Placing Elements at Specific PositionsDeleting Elements in Python Lists: Removing Items SafelyUsing the remove() Method: Deleting Specific Elements from Lists
2. Mastering Python Dictionaries
Creating a Dictionary in Python: Storing Key-Value PairsAccessing Dictionary ValuesAccessing Dictionary KeysAdding Items to a Dictionary: Updating Key-Value PairsUsing the del Keyword: Removing Dictionary EntriesUsing the pop() Method: Deleting Elements with Return ValuesUsing the popitem() Method: Removing the Last Inserted ItemUsing the clear() Method: Emptying a Dictionary Completely
3. Mastering Python Tuples
Creating a Tuple in Python: Defining Immutable Data StructuresAccessing Elements in a Tuple: Indexing TechniqueConcatenating Tuples in Python: Merging Immutable SequencesDeleting Tuples in Python: Removing References to TuplesUpdating Tuples in PythonAdding Items to a Tuple: Alternative Approaches Using ListsCounting Elements in a Tuple: Using the count() MethodFinding Elements in a Tuple: Using the index() Method for Lookup
4. Mastering Python Sets
Creating a Set in Python: Defining Unordered CollectionsUsing the add() Method: Adding Single Elements to a SetUsing the update() Method: Merging Multiple Elements into a SetAccessing Elements in a Set: Iteration and Membership TestingUsing the remove() and discard() MethodsUsing the clear() Method: Removing All Elements from a Set
Accessing Dictionary Keys
To access the keys of a dictionary in Python, you can use the keys() method. This returns a view object that displays all the keys in the dictionary.
book = { "title": "Pride and Prejudice", "author": "Jane Austen", "year": 1813, "genre": "Romance" } keys = book.keys() print(keys) # Output: dict_keys(['title', 'author', 'year', 'genre'])
Iterating Through Keys
You can iterate through the keys in a dictionary using a for loop:
book = { "title": "Pride and Prejudice", "author": "Jane Austen", "year": 1813, "genre": "Romance" } for key in book.keys(): print(key)
Checking for the Existence of a Key
Use the in keyword to check if a specific key exists in the dictionary:
book = { "title": "Pride and Prejudice", "author": "Jane Austen", "year": 1813, "genre": "Romance" } if "author" in book: print("The 'author' key exists in the dictionary.")
Tehtävä
Swipe to start coding
You are given a dictionary authors_books, where the key is the author and the value is a list of their book titles.
- Initialize the variable
keysas a list of the dictionary keys. - Initialize the variable
all_booksas a list of all available book titles. - Use a
forloop to get the book lists by author. - Use a nested
forloop and theappend()method to fill theall_bookslist with all available books.
Ratkaisu
Vaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoistaOliko kaikki selvää?
Kiitos palautteestasi!
Osio 2. Luku 3
Accessing Dictionary Keys
To access the keys of a dictionary in Python, you can use the keys() method. This returns a view object that displays all the keys in the dictionary.
book = { "title": "Pride and Prejudice", "author": "Jane Austen", "year": 1813, "genre": "Romance" } keys = book.keys() print(keys) # Output: dict_keys(['title', 'author', 'year', 'genre'])
Iterating Through Keys
You can iterate through the keys in a dictionary using a for loop:
book = { "title": "Pride and Prejudice", "author": "Jane Austen", "year": 1813, "genre": "Romance" } for key in book.keys(): print(key)
Checking for the Existence of a Key
Use the in keyword to check if a specific key exists in the dictionary:
book = { "title": "Pride and Prejudice", "author": "Jane Austen", "year": 1813, "genre": "Romance" } if "author" in book: print("The 'author' key exists in the dictionary.")
Tehtävä
Swipe to start coding
You are given a dictionary authors_books, where the key is the author and the value is a list of their book titles.
- Initialize the variable
keysas a list of the dictionary keys. - Initialize the variable
all_booksas a list of all available book titles. - Use a
forloop to get the book lists by author. - Use a nested
forloop and theappend()method to fill theall_bookslist with all available books.
Ratkaisu
Vaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoistaOliko kaikki selvää?
Kiitos palautteestasi!
Osio 2. Luku 3
Vaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoista