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Python Data Structures
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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

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Accessing Elements in a Tuple: Indexing Technique

Accessing elements in a tuple is straightforward and works the same way as with lists. Simply specify the index number inside square brackets. Remember, indexing starts at 0, just like with lists.


              
1234567

            
movies = ("Inception", "Interstellar", "The Dark Knight", "Tenet", "Dunkirk", "Memento", "Following")

# Accessing the second movie
print(movies[1])

# Accessing the sixth movie
print(movies[5])
copy

Tuples also support negative indexing, where the indexing begins from the end. Thus, the last element has an index of -1, the second to last is -2, and so on.


              
1234567

            
movies = ("Inception", "Interstellar", "The Dark Knight", "Tenet", "Dunkirk", "Memento", "Following")

# Accessing the last movie
print(movies[-1])

# Accessing the fourth movie from the end
print(movies[-4])
copy

In the example above, we access the last element (indexed at -1) and the fourth element from the end (indexed at -4).

Uppgift

Swipe to start coding

We are continuing to work with the tuple space_movies.

  • Get the first element of this tuple and store it in the variable first_movie.
  • Get the last element of the tuple and store it in the variable last_movie.
  • Initialize a new list favorite_movies and add these 2 movies to it.
  • Use indices to complete this task.

Lösning

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Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 3. Kapitel 2
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book
Accessing Elements in a Tuple: Indexing Technique

Accessing elements in a tuple is straightforward and works the same way as with lists. Simply specify the index number inside square brackets. Remember, indexing starts at 0, just like with lists.


              
1234567

            
movies = ("Inception", "Interstellar", "The Dark Knight", "Tenet", "Dunkirk", "Memento", "Following")

# Accessing the second movie
print(movies[1])

# Accessing the sixth movie
print(movies[5])
copy

Tuples also support negative indexing, where the indexing begins from the end. Thus, the last element has an index of -1, the second to last is -2, and so on.


              
1234567

            
movies = ("Inception", "Interstellar", "The Dark Knight", "Tenet", "Dunkirk", "Memento", "Following")

# Accessing the last movie
print(movies[-1])

# Accessing the fourth movie from the end
print(movies[-4])
copy

In the example above, we access the last element (indexed at -1) and the fourth element from the end (indexed at -4).

Uppgift

Swipe to start coding

We are continuing to work with the tuple space_movies.

  • Get the first element of this tuple and store it in the variable first_movie.
  • Get the last element of the tuple and store it in the variable last_movie.
  • Initialize a new list favorite_movies and add these 2 movies to it.
  • Use indices to complete this task.

Lösning

Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 3. Kapitel 2
Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Vi beklagar att något gick fel. Vad hände?
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