FAQ: Sets - Finding Elements in a Set

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This community-built FAQ covers the “Finding Elements in a Set” exercise from the lesson “Sets”.

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FAQs on the exercise Finding Elements in a Set

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2

Hello,
Found an intresting error example with task 3. I’ve used the generator expression to create bad_tags. then when it comes to remove the items from set I get:

RuntimeError: Set changed size during iteration

the code was (jump to #Write your code section )

allowed_tags = ['pop', 'hip-hop', 'rap', 'dance', 'electronic', 'latin', 'indie', 'alternative rock', 'classical', 'k-pop', 'country', 'rock', 'metal', 'jazz', 'exciting', 'sad', 'happy', 'upbeat', 'party', 'synth', 'rhythmic', 'emotional', 'relationship', 'warm', 'guitar', 'fiddle', 'romance', 'chill', 'swing'] song_data_users = {'Retro Words': ['pop', 'explosion', 'hammer', 'bomb', 'warm', 'due', 'writer', 'happy', 'horrible', 'electric', 'mushroom', 'shed']} # Write your code below! tag_set = set(song_data_users['Retro Words']) bad_tags = (tag for tag in tag_set if tag not in allowed_tags ) for item in bad_tags: print(item) tag_set.remove(item) print(tag_set)

I thought I simplyfy the code with the generator, while seems due to it’s dynamic nature, it wont work here.

Any smart way to workaround without replacing the generator with a explicit for loop?

Thanks,
Krzysztof

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I think I reply myself, the simplest way is to change the bad_tags generator expression to use square brackets:

bad_tags = [tag for tag in tag_set if tag not in allowed_tags ]

as result, the remove method does not have an issue.