shows how we can use always_iterable to write less code

using_always_iterable.py

from functools import reduce
from operator import add
import pytest
from more_itertools import always_iterable


def safer_sum(inputs) -> int:
    iterable_inputs = always_iterable(inputs)  # 1
    return reduce(add, iterable_inputs, 0)  # 1


@pytest.mark.parametrize(
    "sum_input,expected_sum",
    [
        ([1, 2, 3], 6),  # 2
        ([], 0),  # 2
        (42, 42),  # 3
        (None, 0),  # 4
    ],
)
def test_safer_sum_works_with_lists(sum_input, expected_sum):
    assert safer_sum(sum_input) == expected_sum  # 5


def safer_but_complex_sum(inputs) -> int:  # 6
    if inputs is None:
        inputs = []
    if not isinstance(inputs, list):
        inputs = [inputs]
    return reduce(add, inputs, 0)