[lang-ref] ( padding_zero ) ( python )

@pytest.mark.parametrize(
    'value, fmt, expected',
    [
        (123, r'%05d', '00123'),
        (123.456, r'%.5f', '123.45600'),
    ],
)
def test_padding_zero(value, fmt, expected):
    assert fmt % value == expected
    # memo: pad zero left alternative : zfill(), rjust(s, '0')