>>> import albatross
>>> ctx = albatross.SimpleContext('.')
>>> ctx.locals.simple = 0
>>> ctx.locals.works = 1
>>> albatross.Template(ctx, '<magic>', '''
... <al-lookup name="bool"><al-item expr="0">FALSE</al-item>TRUE</al-lookup>
... Simple: <al-value expr="simple" lookup="bool" whitespace>
...  Works: <al-value expr="works" lookup="bool" whitespace>
... ''').to_html(ctx)
>>> ctx.flush_content()
Simple: FALSE
 Works: TRUE