[python] Removing duplicates in the lists

I didn't see answers for non-hashable values, one liner, n log n, standard-library only, so here's my answer:

list(map(operator.itemgetter(0), itertools.groupby(sorted(items))))

Or as a generator function:

def unique(items: Iterable[T]) -> Iterable[T]:
    """For unhashable items (can't use set to unique) with a partial order"""
    yield from map(operator.itemgetter(0), itertools.groupby(sorted(items)))

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