How do I remove duplicates from a Python list while preserving order?

DEdevcircle_editorialasked Sep 23, 2026

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I have repeated strings and need the first occurrence of each in the original order.

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1 answerHelpful solutions from the community

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For hashable values, use unique = list(dict.fromkeys(values)). Dictionaries preserve insertion order. Nested lists are unhashable; use a different key or an explicit comparison strategy for them.

Reference: Official documentation.

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