just got updated to colander 1.0a1 / deform 0.9.6 
(I am on python3.2), a simple example:


import deform
import colander

class FooSchema(colander.MappingSchema):
       foo=colander.SchemaNode(colander.Bool(),
                               title='Foo',
                               missing=False)
       bar=colander.SchemaNode(colander.String(), 
                               title='Bar', 
                               missing='')


schema=FooSchema()
form=deform.Form(schema, buttons=('ok',))
appstruct={'foo': True, 'bar': 'some baz'}

form.render(appstruct)
# ...still works


# but watch out now, when rendering with readonly=True, see below
# any idea ? / anything I am doing wrong or that has changed and I need
# to adjust ?

# -Andreas



form.render(appstruct, readonly=True)

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/home/reuleaux/eggs/deform-0.9.6-py3.2.egg/deform/field.py", line 494, 
in render
    html = self.serialize(cstruct, **kw)
  File "/home/reuleaux/eggs/deform-0.9.6-py3.2.egg/deform/field.py", line 455, 
in serialize
    return self.widget.serialize(**values)
  File "/home/reuleaux/eggs/deform-0.9.6-py3.2.egg/deform/widget.py", line 
1145, in serialize
    return field.renderer(template, **values)
  File "/home/reuleaux/eggs/deform-0.9.6-py3.2.egg/deform/template.py", line 
69, in __call__
    return self.load(template_name)(**kw)
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/template.py", 
line 125, in __call__
    return self.render(**kwargs)
  File 
"/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/zpt/template.py", line 
257, in render
    return super(PageTemplate, self).render(**vars)
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/template.py", 
line 172, in render
    self._render(stream, econtext, rcontext)
  File "form_6c89eed45342953111029356c8e50384334bf899.py", line 279, in render
  File "/home/reuleaux/eggs/deform-0.9.6-py3.2.egg/deform/field.py", line 684, 
in render_template
    return self.renderer(template, **values)
  File "/home/reuleaux/eggs/deform-0.9.6-py3.2.egg/deform/template.py", line 
69, in __call__
    return self.load(template_name)(**kw)
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/template.py", 
line 125, in __call__
    return self.render(**kwargs)
  File 
"/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/zpt/template.py", line 
257, in render
    return super(PageTemplate, self).render(**vars)
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/template.py", 
line 190, in render
    raise_with_traceback(exc, tb)
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/utils.py", line 
73, in raise_with_traceback
    raise exc
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/template.py", 
line 172, in render
    self._render(stream, econtext, rcontext)
  File "mapping_item_32d4a36147251899e5642484ecfc3a2eb1b2e80b.py", line 246, in 
render
  File "/home/reuleaux/eggs/deform-0.9.6-py3.2.egg/deform/field.py", line 455, 
in serialize
    return self.widget.serialize(**values)
  File "/home/reuleaux/eggs/deform-0.9.6-py3.2.egg/deform/widget.py", line 777, 
in serialize
    return field.renderer(template, **values)
  File "/home/reuleaux/eggs/deform-0.9.6-py3.2.egg/deform/template.py", line 
69, in __call__
    return self.load(template_name)(**kw)
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/template.py", 
line 125, in __call__
    return self.render(**kwargs)
  File 
"/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/zpt/template.py", line 
257, in render
    return super(PageTemplate, self).render(**vars)
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/template.py", 
line 169, in render
    self.cook_check()
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/template.py", 
line 293, in cook_check
    self.cook(body)
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/template.py", 
line 147, in cook
    program = self._cook(body, digest, names)
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/template.py", 
line 218, in _cook
    source = self._make(body, builtins)
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/template.py", 
line 249, in _make
    program = self.parse(body)
  File 
"/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/zpt/template.py", line 
202, in parse
    trim_attribute_space=self.trim_attribute_space,
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/zpt/program.py", 
line 145, in __init__
    super(MacroProgram, self).__init__(*args, **kwargs)
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/program.py", 
line 32, in __init__
    node = self.visit(kind, args)
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/program.py", 
line 38, in visit
    return visitor(*args)
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/zpt/program.py", 
line 352, in visit_element
    defines = tal.parse_defines(clause)
  File "/home/reuleaux/eggs/Chameleon-2.11-py3.2.egg/chameleon/tal.py", line 
158, in parse_defines
    raise LanguageError("Invalid define syntax", part)
chameleon.exc.LanguageError: chameleon.exc.LanguageError: Invalid define syntax

 - String:     "
                  true_val|field.widget.true_val"
 - Filename:   
/home/reuleaux/eggs/deform-0.9.6-py3.2.egg/deform/templates/readonly/checkbox.pt
 - Location:   (1:35)

 - Expression: "child.render_template(item_tmpl)"
 - Filename:   ... deform-0.9.6-py3.2.egg/deform/templates/readonly/form.pt
 - Location:   (21:31)
 - Source:     ... place="structure child.render_template(item_tmpl)"/>
                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 - Expression: "field.serialize(cstruct, readonly=True)"
 - Filename:   ... .9.6-py3.2.egg/deform/templates/readonly/mapping_item.pt
 - Location:   (12:31)
 - Source:     ... ce="structure field.serialize(cstruct, readonly=True)"/>
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 - Arguments:  category: default
               repeat: {...} (0)
               description: 
               field: <Field - at 0x3ee91d0>
               cstruct: true
               title: Foo
               hidden: False

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