Best practices in software engineering

"""
This module contains functions for manipulating and combining Python lists.
"""

def add_arrays(x, y):
    """
    This function adds together each element of the two passed lists.

    Args:
        x (list): The first list to add
        y (list): The second list to add

    Returns:
        list: the pairwise sums of ``x`` and ``y``.

    Examples:
        >>> add_arrays([1, 4, 5], [4, 3, 5])
        [5, 7, 10]
    """
    z = []
    for x_, y_ in zip(x, y):
        z.append(x_ + y_)

    return z

import pytest

from arrays import add_arrays

@pytest.mark.parametrize("a, b, expect", [
    ([1, 2, 3], [4, 5, 6], [5, 7, 9]),
    ([-1, -5, -3], [-4, -3, 0], [-5, -8, -3]),
    ([41, 0, 3], [4, 76, 32], [45, 76, 35]),
    ([], [], []),
])
def test_add_arrays(a, b, expect):
    output = add_arrays(a, b)
    
    assert output == expect

pytest test_arrays.py

=================== test session starts ====================
platform linux -- Python 3.8.5, pytest-6.0.1, py-1.9.0, pluggy-0.13.1
rootdir: /home/matt/projects/courses/software_engineering_best_practices
plugins: attrib-0.1.3, requests-mock-1.8.0, cov-2.10.1, hypothesis-5.24.2
collected 4 items                                          

test_arrays.py ....                                  [100%]

==================== 4 passed in 0.01s =====================