Python program to remove duplicates from a list

Description: Write a Python program to remove the duplicate items from a list.

Rules and hints:

• A set keeps only unique values, but it does not keep the order.
• dict.fromkeys() keeps the order of the first appearance.

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Python program to remove duplicates from a list

items = [1, 2, 2, 3, 4, 4, 5]

unique_sorted = sorted(set(items))
unique_ordered = list(dict.fromkeys(items))

print(unique_sorted)
print(unique_ordered)

Output:

How it works

• set(items) removes the duplicates, and sorted() makes a sorted list of it.
• A dictionary cannot have duplicate keys, and in Python 3.7+ it keeps the insertion order. So dict.fromkeys(items) followed by list() keeps the first order.

Related: Python Sets and Python Dictionary.

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