[lang-ref] ( format_with_thousands_separator ) ( python )

@pytest.mark.parametrize(
    'v, expected',
    [
        (12345678, '12,345,678'),
        (-12345678, '-12,345,678'),
        (-12345678.76543, '-12,345,678.76543'),
    ],
)
def test_format_with_thousands_separator(v, expected):
    # f'{v:,}'

    a = f'{v:,}'

    assert a == expected

    # Note: printf-like-format : not supports ','.
    # a = '%,d' % v

@pytest.mark.parametrize(
    'v, expected',
    [
        (12345678, '12,345,678'),
        (-12345678, '-12,345,678'),
        (-12345678.76543, '-12,345,678.76543'),
    ],
)
def test_format_with_thousands_separator_alternative(v, expected):
    # format(v, ',')

    a = format(v, ',')

    assert a == expected