>>> import albatross
>>> class Field:
...     def __init__(self, label, value):
...         self.label = label
...         self.value = value
... 
>>> ctx = albatross.SimpleContext('.')
>>> ctx.locals.fields = [
...     Field('Name', 'Smith'), 
...     Field('Age', 23)
... ]
>>> albatross.Template(ctx, '<magic>', '''
... <al-for namespace="fields">
...  <al-value expr="label"> <al-input name="value" whitespace>
... </al-for>
... ''').to_html(ctx)
>>> ctx.flush_content()
Name <input name="fields[0].value" value="Smith" />
Age <input name="fields[1].value" value="23" />
