Task 2

import traceback


def find_unique(lst):
    count = 0
    data = list(set(lst))
    print(data)
    true_data = []
    for i in data:
        for k in range(len(lst)):
            if lst[k] == i:
                count += 1
        if count == 1:
            true_data.append(i)
        count = 0
    print(true_data)

    return true_data


# Тесты
try:
    assert find_unique([1, 1, 1, 2, 1, 1]) == [2]
    assert find_unique([0, 0, 0.55, 0, 0.66]) == [0.55, 0.66]
    assert find_unique([1, 2, 3, 4, 5]) == [1, 2, 3, 4, 5]
except AssertionError:
    print("TEST ERROR")
    traceback.print_exc()
else:
    print("TEST PASSED")