FAQ: Sets - Set Union

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This community-built FAQ covers the “Set Union” exercise from the lesson “Sets”.

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This exercise can be found in the following Codecademy content:

FAQs on the exercise Set Union

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I have a question about this exercise. I percieve that the goal is to to use union to merge the tag sets togather so that we have a full collection of tags. I see that the code loops over song_data(items()) and grabs the keys and values of the song_data dictionary.

song_tag_set = set(val) → so this would be going over the song_data dictionary and grabbing the values at each iteration. I observe if I print it that it targets ‘Lowkey Space’ keys.

user_tag_set = set(user_tag_data[key] → When I print this I observe it targets user_tag_data dictionary and prints the ‘Lowkey Space keys’.

Why aren’t the for loops inputting into the sets all of the keys such as ‘Retro Words’ ‘Wait For Limit’ ‘Stomping Cue’ and ‘Lowkey Space’?

Why isn’t user_tag_set not holding all of the key values of user_tag_data. such as ‘Lowkey Space’, ‘Retro Words’, ‘Wait For Limit’ ‘Stomping Cue’

What exactly is going on in this code?

Link to Exercise: Learn Intermediate Python 3 | Codecademy

song_data = {'Retro Words': ['pop', 'warm', 'happy', 'electronic'],
             'Wait For Limit': ['rap', 'upbeat', 'romance'],
             'Stomping Cue': ['country', 'fiddle', 'party'],
             'Lowkey Space': ['electronic', 'dance', 'synth']}

user_tag_data = {'Lowkey Space': ['party', 'synth', 'fast', 'upbeat'],
                 'Retro Words': ['happy', 'electronic', 'fun', 'exciting'],
                 'Wait For Limit': ['romance', 'chill', 'rap', 'rhythmic'], 
                 'Stomping Cue': ['country', 'swing', 'party', 'instrumental']}

# Write your code below!
new_song_data = {}

for key, val in song_data.items():
  song_tag_set = set(val) # targets 'Lowkey Space'
  user_tag_set = set(user_tag_data[key]) # targets Lowkey Space
  new_song_data[key] = song_tag_set.union(user_tag_set)

print(song_tag_set)
print(user_tag_set)
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