Python Duplicate Removal

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Problem

Write a Python program to remove duplicates from a list.

Implement remove_duplicates(items) so it returns a new list containing each value only once, preserving the order of its first occurrence. The input list contains hashable values, and the original list must not be modified.

Function Contract

Input: a list of hashable values
Output: a new list with duplicates removed

Examples:

[3, 1, 3, 2, 1] returns [3, 1, 2].
[] returns [].

Constraints: 0 <= len(items) <= 10^4.

Constraints

0 <= len(items) <= 10^4
Every item is hashable
The original list must not be modified
The first occurrence of each value must be preserved

Function Signature

def remove_duplicates(items):

Your solutionPython 3

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