def test_function(
    iterator,
    items
) -> int:
    """Sum two numbers."""
    print(iterator)
    sleep(1)
    return items['a'] + items['b']

# Import multithreader.
from multithreader import threads

# Define arguments.
items = {
    'a': 1,
    'b': 2
}

# Define iterators.
iterators = [1, 2, 3, 4, 5]

# Execute function with multithreading.
results = threads(
    test_function,
    iterators,
    items,
    thread_num=int(sys.argv[1])
)

# Print results.
print(results)