[lang-ref] ( unshift ) ( python )

def test_unshift():
    # insert(0, v)
    items = ['B', 'C', 'D', 'E']
    expected = ['A', 'B', 'C', 'D', 'E']

    items.insert(0, 'A')

    assert items == expected

    # if performance matters, consider using appendleft in collections.deque