Unique Elements from a List

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Your question is Unique Elements from a List. Start with the requirements on the right.

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Problem

Given a list nums of integers, return a new list containing only the unique elements from nums in the order of their first appearance. The input is a Python list, and the output must also be a Python list.

Constraints

0 <= len(nums) <= 10^5
-10^9 <= nums[i] <= 10^9
Preserve the order of first occurrence in the result

Function Signature

def unique_elements(nums):

Your solutionPython 3

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