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Sets

In Python, a set is an unordered collection of unique elements. Think of it as your exclusive music collection where each track is distinct. Sets are perfect for situations where you need to eliminate duplicates and focus on unique items.

Here's how you can create a set in Python:


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# Creating a set of music genres
music_genres = {"Jazz", "Rock", "Classical", "Jazz"}
print(music_genres)

Notice how "Jazz" appears only once in the output? That's the power of sets—they automatically remove duplicates.

Just like updating your playlist with new tracks, you can add elements to a set using the add() method. If you decide a track no longer fits your vibe, you can remove it using the remove() method


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music_genres = {"Jazz", "Rock", "Classical", "Jazz"}

# Adding a new genre
music_genres.add("Blues")
print(music_genres)

# Removing a genre
music_genres.remove("Rock")
print(music_genres)

Sets are not just about uniqueness; they also allow you to perform interesting operations, much like mixing tracks to create a unique sound. Here are a few operations you can perform with sets:

Union: Combine two sets to see all unique elements from both.
Intersection: Find common elements between sets, like discovering shared influences between artists.
Difference: Identify elements present in one set but not the other, akin to finding unique tracks in your collection.


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music_genres = {"Jazz", "Rock", "Classical", "Jazz"}
more_genres = {"Hip Hop", "Electronic", "Jazz"}

# Union of two sets
all_genres = music_genres.union(more_genres)
print(all_genres)

# Intersection of two sets
common_genres = music_genres.intersection(more_genres)
print(common_genres)

# Difference between two sets
unique_genres = music_genres.difference(more_genres)
print(unique_genres)

Opgave

Swipe to start coding

Complete the get_unique_artists_count function that calculates the number of unique artists from a list of artist names. This function is useful for determining how many distinct artists are present in the list, especially when the list may contain multiple entries for the same artist.

Inputs:

artists: A list of strings where each string represents the name of an artist.

Steps:

Create a Set of Unique Artists: Convert the list of artist names into a set to eliminate any duplicate names, as sets automatically enforce uniqueness.
Return the Count: Use the len() function to return the number of unique artists present in the set.

Løsning

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Sektion 2. Kapitel 5

solution.py

main.py

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Sets

Here's how you can create a set in Python:


              123
            
# Creating a set of music genres
music_genres = {"Jazz", "Rock", "Classical", "Jazz"}
print(music_genres)

Notice how "Jazz" appears only once in the output? That's the power of sets—they automatically remove duplicates.


              123456789
            
music_genres = {"Jazz", "Rock", "Classical", "Jazz"}

# Adding a new genre
music_genres.add("Blues")
print(music_genres)

# Removing a genre
music_genres.remove("Rock")
print(music_genres)

Sets are not just about uniqueness; they also allow you to perform interesting operations, much like mixing tracks to create a unique sound. Here are a few operations you can perform with sets:

Union: Combine two sets to see all unique elements from both.
Intersection: Find common elements between sets, like discovering shared influences between artists.
Difference: Identify elements present in one set but not the other, akin to finding unique tracks in your collection.


              1234567891011121314
            
music_genres = {"Jazz", "Rock", "Classical", "Jazz"}
more_genres = {"Hip Hop", "Electronic", "Jazz"}

# Union of two sets
all_genres = music_genres.union(more_genres)
print(all_genres)

# Intersection of two sets
common_genres = music_genres.intersection(more_genres)
print(common_genres)

# Difference between two sets
unique_genres = music_genres.difference(more_genres)
print(unique_genres)

Opgave

Swipe to start coding

Inputs:

artists: A list of strings where each string represents the name of an artist.

Steps:

Create a Set of Unique Artists: Convert the list of artist names into a set to eliminate any duplicate names, as sets automatically enforce uniqueness.
Return the Count: Use the len() function to return the number of unique artists present in the set.

Løsning

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder

Var alt klart?

Tak for dine kommentarer!

Sektion 2. Kapitel 5

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder