[lang-ref] ( is_lower ) ( python )

@pytest.mark.parametrize(
    'text, expected',
    [
        ('ABC', False),
        ('Abc', False),
        ('abc', True),
        ('abc def', True), # spaces are ignored
        (' ', False),      # returns False when there are no letters
        ('', False),
    ],
)
def test_is_lower(text, expected):
    # islower
    assert text.islower() is expected