Please when i try to run the code "Print(data_set.remove(21))" it keeps returning none on the code. please any explanation for this. 21 is included in the data_set Thanks.

Hey Abdulgafar, Thank you for your question! It returns None since you are not trying to print out data_set but rather data_set.remove(21) which is of type None: Make sure you execute the code in the following way: Hope this helps! Kind regards, 365 Hristina

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