Removing duplicates in lists

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How can I determine whether a list contains any duplicates and then produce a fresh list free of them?

Feb 15, 2023 in Python by Arya
• 990 points
698 views

1 answer to this question.

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1)To get rid of duplicate items, convert the list to a set.
2)Compare the original list's length to the set's length. There are no duplicates in the list if they are the same. Otherwise, there are duplicates on the list.

For ex:

my_list = [1, 2, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9]

# check if the list contains duplicates
if len(my_list) != len(set(my_list)):
    # if the list contains duplicates, create a new list without duplicates
    new_list = []
    for item in my_list:
        if item not in new_list:
            new_list.append(item)
else:
    # if the list does not contain duplicates, use the original list
    new_list = my_list

print(new_list) # output: [1, 2, 3, 4, 5, 6, 7, 8, 9]

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answered Feb 16, 2023 by Rishu
• 300 points

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