>>> import albatross
>>> ctx = albatross.SimpleContext('.')
>>> ctx.locals.items = [(1.23, 'Red'), (4.71, 'Green'), (0.33, 'Blue')]
>>> albatross.Template(ctx, '<magic>', '''
... <al-for vars="price, label" expr="items">
...  <al-value expr="'$%0.2f' % price"> <al-value expr="label" whitespace>
... </al-for>
... ''').to_html(ctx)
>>> ctx.flush_content()
$1.23 Red
$4.71 Green
$0.33 Blue
