Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.Lære Using the remove() and discard() Methods | Mastering Python Sets
Python Data Structures
course content

Kursusindhold

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

book
Using the remove() and discard() Methods

Sets in Python allow you to remove elements using the remove() and discard() methods. While both methods remove specific elements, there is a key difference:

  • remove(): raises a KeyError if the element is not in the set;
  • discard(): does not raise an error if the element is not found; it simply leaves the set unchanged.

Let's explore these methods using a movie collection theme.


              
123456

            
# Attempting to remove movies
movies = {"Inception", "Interstellar", "Tenet", "Dunkirk"}

# Remove specific movies
movies.remove("Dunkirk")
movies.remove("Avatar")  # This will raise a `KeyError`
copy

Now, let's use the discard() method, which behaves similarly but avoids errors if the specified movie is not in the set.


              
12345678910

            
# Define a set of favorite movies
movies = {"Inception", "Interstellar", "Tenet", "Dunkirk", "Memento"}

# Remove specific movies using discard
movies.discard("Dunkirk")
movies.discard("Memento")
movies.discard("Avatar")

# Print the result
print("Final set:", movies)
copy
Opgave

Swipe to start coding

You are given the set marvel_movies. However, two movies from another studio have accidentally been added to this set.

  • Remove the movie "The Dark Knight" from the set.
  • Remove the movie "Justice League" from the set.
  • Use the discard() or remove() methods to accomplish this task.

Løsning

Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 4. Kapitel 5
toggle bottom row

book
Using the remove() and discard() Methods

Sets in Python allow you to remove elements using the remove() and discard() methods. While both methods remove specific elements, there is a key difference:

  • remove(): raises a KeyError if the element is not in the set;
  • discard(): does not raise an error if the element is not found; it simply leaves the set unchanged.

Let's explore these methods using a movie collection theme.


              
123456

            
# Attempting to remove movies
movies = {"Inception", "Interstellar", "Tenet", "Dunkirk"}

# Remove specific movies
movies.remove("Dunkirk")
movies.remove("Avatar")  # This will raise a `KeyError`
copy

Now, let's use the discard() method, which behaves similarly but avoids errors if the specified movie is not in the set.


              
12345678910

            
# Define a set of favorite movies
movies = {"Inception", "Interstellar", "Tenet", "Dunkirk", "Memento"}

# Remove specific movies using discard
movies.discard("Dunkirk")
movies.discard("Memento")
movies.discard("Avatar")

# Print the result
print("Final set:", movies)
copy
Opgave

Swipe to start coding

You are given the set marvel_movies. However, two movies from another studio have accidentally been added to this set.

  • Remove the movie "The Dark Knight" from the set.
  • Remove the movie "Justice League" from the set.
  • Use the discard() or remove() methods to accomplish this task.

Løsning

Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 4. Kapitel 5
Switch to desktopSkift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder
Vi beklager, at noget gik galt. Hvad skete der?
some-alt