Re: [Zope3-Users] Formlib and invariants

[Darryl Cousins]

Hi Florian,

Yup. Thanks for that, much more elegant and passing in an error string
displays nicely with error_views.

Cheers,
Darryl

On Wed, 2006-07-19 at 22:18 +0200, Florian Lindner wrote:
> Am Mittwoch, 19. Juli 2006 03:25 schrieb Darryl Cousins:
> > Hi All,
> >
> > I've had a bit of a struggle getting formlib error views to play nicely
> > with invariants. That is the problem I have found to trouble me is in
> > the zope.formlib.form.FormBase method error_views.
> >
> > When I use the schema:
> >
> > class IMemberRegisterForm(IMemberData, IMemberDetails):
> > """Schema for a member register form."""
> >
> > new_password = Password(
> > title=_("Choose a Password"),
> > required=True)
> >
> > verify_password = Password(
> > title=_("Verify Password"),
> > required=True)
> >
> > @invariant
> > def passwordsMatch(register):
> > if register.new_password != register.verify_password:
> > msg = _("Entered passwords do not match")
> > error = ('verify_password', _("Passwords"), msg)
> > raise Invalid(error)
> 
> [...]
> 
> I am not sure if I've understood you correctly, but I've solved the same 
> problem (raise error if passwords are not equal) this way:
> 
> 
> class PasswordsAreNotEqual(ValidationError):
> """The passwords are not equal."""
> interface.implements(IWidgetInputError)
> 
> class IRegistrationForm(interface.Interface):
> """For entering the data for registration."""
> 
> password = Password(title=u"Password",
> description=u"Your password.",
> required=True)
>  
> password2 = Password(title=u"Verify Password",
> required=True)
> 
> @interface.invariant
> def arePasswordsEqual(obj):
> if obj.password != obj.password2:
> raise PasswordsAreNotEqual
> 
> 
> Hope this helps,
> 
> Florian

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Re: [Zope3-Users] Formlib and invariants

[Florian Lindner]

Am Mittwoch, 19. Juli 2006 03:25 schrieb Darryl Cousins:
> Hi All,
>
> I've had a bit of a struggle getting formlib error views to play nicely
> with invariants. That is the problem I have found to trouble me is in
> the zope.formlib.form.FormBase method error_views.
>
> When I use the schema:
>
> class IMemberRegisterForm(IMemberData, IMemberDetails):
> """Schema for a member register form."""
>
> new_password = Password(
> title=_("Choose a Password"),
> required=True)
>
> verify_password = Password(
> title=_("Verify Password"),
> required=True)
>
> @invariant
> def passwordsMatch(register):
> if register.new_password != register.verify_password:
> msg = _("Entered passwords do not match")
> error = ('verify_password', _("Passwords"), msg)
> raise Invalid(error)

[...]

I am not sure if I've understood you correctly, but I've solved the same 
problem (raise error if passwords are not equal) this way:


class PasswordsAreNotEqual(ValidationError):
"""The passwords are not equal."""
interface.implements(IWidgetInputError)

class IRegistrationForm(interface.Interface):
"""For entering the data for registration."""

password = Password(title=u"Password",
description=u"Your password.",
required=True)
 
password2 = Password(title=u"Verify Password",
required=True)

@interface.invariant
def arePasswordsEqual(obj):
if obj.password != obj.password2:
raise PasswordsAreNotEqual


Hope this helps,

Florian
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[Zope3-Users] Formlib and invariants

[Darryl Cousins]

Hi All,

I've had a bit of a struggle getting formlib error views to play nicely
with invariants. That is the problem I have found to trouble me is in
the zope.formlib.form.FormBase method error_views.

When I use the schema:

class IMemberRegisterForm(IMemberData, IMemberDetails):
"""Schema for a member register form."""

new_password = Password(
title=_("Choose a Password"),
required=True)

verify_password = Password(
title=_("Verify Password"),
required=True)

@invariant
def passwordsMatch(register):
if register.new_password != register.verify_password:
msg = _("Entered passwords do not match")
error = ('verify_password', _("Passwords"), msg)
raise Invalid(error)

As far as I can ascertain I must raise the Invalid exception so that it
is caught correctly in zope.interface.interface.InterfaceClass
validateInvariants method.

Now when the FormBase error_views method is called there is no
multiadapter for the Invalid exception. First option then is to create a
view for Invalid, I passed on that, and instead redefined error_views in
my view class with the following:

def error_views(self):
for error in self.errors:
if isinstance(error, basestring):
yield error
else:
if not isinstance(error, WidgetInputError):
e = list(error)[0]
error = WidgetInputError(e[0], e[1], e[2])
if isinstance(error, WidgetInputError):
view = getMultiAdapter(
(error, self.request), IWidgetInputErrorView)
title = getattr(error, 'widget_title', None)
if title:
yield '%s: %s' % (title, view.snippet())
else:
yield view.snippet()

There must be a cleaner way to do the same. That is to convert the
Invalid error to a WidgetInputError.

Has anyone done better? I am sure.

Best regards,
Darryl


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Re: [Zope3-Users] Formlib and invariants?

[Bernd Dorn]

On 05.05.2006, at 03:15, Gary Poster wrote:



On May 4, 2006, at 7:44 AM, Bernd Dorn wrote:



On 04.05.2006, at 13:35, Gary Poster wrote:



On May 3, 2006, at 11:51 PM, Bernd Dorn wrote:

yes, this should really be fixed up in the default  
implementation of formlib


because interface.Invalid has no registered multiadapter to
 zope.app.form.browser.interfaces.IWidgetInputErrorView

you have to raise a WidgetInputError

an example for such an error:

from zope.schema import Datetime,Bool,ValidationError
from zope.app.form.interfaces import IWidgetInputError

class FromGreaterThanTo(ValidationError):
u"""From-Date is after To-Date"""

# this is needed to adapt to a view for formlib
implements(IWidgetInputError)


Well, you can raise any error from an invariant that  
extends...zope.interface.Invalid, maybe?  The invariant interface  
says what is allowed somewhere in zope.interface.


...I suppose we could have a generic view for Invalid errors that  
simply said "This is invalid, try again"?  Doesn't seem very  
useful to me.


You are responsible for making sure you have a reasonable  
exception view of an exception you raise.  I'm inclined to think  
that this is a documentation bug at worst.




yes, because in form.txt Invalid is used directly, wich implies  
that this should work


Would you mind putting in a collector issue for this?



http://www.zope.org/Collectors/Zope3-dev/599


Thanks

Gary


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Re: [Zope3-Users] Formlib and invariants?

[Gary Poster]

On May 4, 2006, at 7:44 AM, Bernd Dorn wrote:



On 04.05.2006, at 13:35, Gary Poster wrote:



On May 3, 2006, at 11:51 PM, Bernd Dorn wrote:

yes, this should really be fixed up in the default implementation  
of formlib


because interface.Invalid has no registered multiadapter to
 zope.app.form.browser.interfaces.IWidgetInputErrorView

you have to raise a WidgetInputError

an example for such an error:

from zope.schema import Datetime,Bool,ValidationError
from zope.app.form.interfaces import IWidgetInputError

class FromGreaterThanTo(ValidationError):
u"""From-Date is after To-Date"""

# this is needed to adapt to a view for formlib
implements(IWidgetInputError)


Well, you can raise any error from an invariant that  
extends...zope.interface.Invalid, maybe?  The invariant interface  
says what is allowed somewhere in zope.interface.


...I suppose we could have a generic view for Invalid errors that  
simply said "This is invalid, try again"?  Doesn't seem very  
useful to me.


You are responsible for making sure you have a reasonable  
exception view of an exception you raise.  I'm inclined to think  
that this is a documentation bug at worst.




yes, because in form.txt Invalid is used directly, wich implies  
that this should work


Would you mind putting in a collector issue for this?

Thanks

Gary
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Re: [Zope3-Users] Formlib and invariants?

[mats.nordgren]

Bernd,

That took care of it.  Thanks a million.

Mats

On Thu, 4 May 2006 05:51:52 +0200, Bernd Dorn wrote
> yes, this should really be fixed up in the default implementation of 
>  formlib
> 
> because interface.Invalid has no registered multiadapter to
>   zope.app.form.browser.interfaces.IWidgetInputErrorView
> 
> you have to raise a WidgetInputError
> 
> an example for such an error:
> 
> from zope.schema import Datetime,Bool,ValidationError
> from zope.app.form.interfaces import IWidgetInputError
> 
> class FromGreaterThanTo(ValidationError):
>  u"""From-Date is after To-Date"""
> 
>  # this is needed to adapt to a view for formlib
>  implements(IWidgetInputError)
> 
> On 03.05.2006, at 20:59, mats.nordgren wrote:
> 
> > I'm trying to do a join form with formlib and are getting errors  
> > when checking
> > invariants.
> >
> > I have my form interface IJoinForm
> >
> > class IJoinForm(Interface):
> > """a join form"""
> >
> > username = schema.TextLine(
> > title=_('User Name'),
> > required=True)
> > password = schema.Password(
> > title=_('Password'))
> > password_check = schema.Password(
> > title=_('Enter Password Again'))
> > title = schema.TextLine(
> > title=_('Title'))
> >
> > @invariant
> > def checkPasswords(obj):
> > if obj.password != obj.password_check:
> > raise Invalid("Passwords do not match")
> >
> > And then I have my implementation of form.Form:
> >
> > class JoinMetroSite(form.Form):
> > form_fields = form.Fields(IJoinForm)
> >
> > @form.action('Join')
> > def handle_join_action(self, action, data):
> > principal_folder = zapi.getUtility(IAuthenticatorPlugin,  
> > 'principal')
> > principal = InternalPrincipal(data['username'], data 
> > ['password'],
> > data['title'])
> > principal_folder[data['username']] = principal
> >
> > My form in registered with:
> >
> >  > for="*"
> > class=".metrositeforms.JoinMetroSite"
> > name="join.html"
> > permission="zope.View"
> > menu="zmi_views" title="Join" />
> >
> > When I try the join.html form I get the following error:
> >
> > Traceback (innermost last):
> >   Module zope.publisher.publish, line 138, in publish
> > result = publication.callObject(request, object)
> >   Module zope.app.publication.zopepublication, line 161, in callObject
> > return mapply(ob, request.getPositionalArguments(), request)
> >   Module zope.publisher.publish, line 113, in mapply
> > return debug_call(object, args)
> >- __traceback_info__:  > zope.app.publisher.browser.viewmeta.JoinMetroSite instance at  
> > 0x034C9B50>
> >   Module zope.publisher.publish, line 119, in debug_call
> > return object(*args)
> >   Module zope.formlib.form, line 739, in __call__
> > return self.render()
> >   Module zope.formlib.form, line 733, in render
> > self.form_result = self.template()
> >   Module zope.app.pagetemplate.viewpagetemplatefile, line 83, in  
> > __call__
> > return self.im_func(im_self, *args, **kw)
> >   Module zope.app.pagetemplate.viewpagetemplatefile, line 51, in  
> > __call__
> > sourceAnnotations=getattr(debug_flags, 'sourceAnnotations', 0),
> >   Module zope.pagetemplate.pagetemplate, line 117, in pt_render
> > strictinsert=0, sourceAnnotations=sourceAnnotations)()
> >   Module zope.tal.talinterpreter, line 277, in __call__
> > self.interpret(self.program)
> >   Module zope.tal.talinterpreter, line 352, in interpret
> > handlers[opcode](self, args)
> >   Module zope.tal.talinterpreter, line 878, in do_defineMacro
> > self.interpret(macro)
> >   Module zope.tal.talinterpreter, line 352, in interpret
> > handlers[opcode](self, args)
> >   Module zope.tal.talinterpreter, line 926, in do_extendMacro
> > definingName, extending)
> >   Module zope.tal.talinterpreter, line 908, in do_useMacro
> > self.interpret(macro)
> >   Module zope.tal.talinterpreter, line 352, in interpret
> > handlers[opcode](self, args)
> >   Module zope.tal.talinterpreter, line 538, in do_optTag_tal
> > self.do_optTag(stuff)
> >   Module zope.tal.talinterpreter, line 523, in do_optTag
> > return self.no_tag(start, program)
> >   Module zope.tal.talinterpreter, line 518, in no_tag
> > self.interpret(program)
> >   Module zope.tal.talinterpreter, line 352, in interpret
> > handlers[opcode](self, args)
> >   Module zope.tal.talinterpreter, line 878, in do_defineMacro
> > self.interpret(macro)
> >   Module zope.tal.talinterpreter, line 352, in interpret
> > handlers[opcode](self, args)
> >   Module zope.tal.talinterpreter, line 976, in do_defineSlot
> > self.interpret(block)
> >   Module zope.tal.talinterpreter, line 352, in interpret
> > handlers[opcode](self, args)
> >   Module zope.tal.talinterpreter, line 966, in do_defineSlot
> > self.interpret(slot)
> >   Module zope.tal.talinterpreter, line 352, in interpr

Re: [Zope3-Users] Formlib and invariants?

[Bernd Dorn]

On 04.05.2006, at 13:35, Gary Poster wrote:



On May 3, 2006, at 11:51 PM, Bernd Dorn wrote:

yes, this should really be fixed up in the default implementation  
of formlib


because interface.Invalid has no registered multiadapter to
 zope.app.form.browser.interfaces.IWidgetInputErrorView

you have to raise a WidgetInputError

an example for such an error:

from zope.schema import Datetime,Bool,ValidationError
from zope.app.form.interfaces import IWidgetInputError

class FromGreaterThanTo(ValidationError):
u"""From-Date is after To-Date"""

# this is needed to adapt to a view for formlib
implements(IWidgetInputError)


Well, you can raise any error from an invariant that  
extends...zope.interface.Invalid, maybe?  The invariant interface  
says what is allowed somewhere in zope.interface.


...I suppose we could have a generic view for Invalid errors that  
simply said "This is invalid, try again"?  Doesn't seem very useful  
to me.


You are responsible for making sure you have a reasonable exception  
view of an exception you raise.  I'm inclined to think that this is  
a documentation bug at worst.




yes, because in form.txt Invalid is used directly, wich implies that  
this should work





Gary


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Re: [Zope3-Users] Formlib and invariants?

[Gary Poster]

On May 3, 2006, at 11:51 PM, Bernd Dorn wrote:

yes, this should really be fixed up in the default implementation  
of formlib


because interface.Invalid has no registered multiadapter to
 zope.app.form.browser.interfaces.IWidgetInputErrorView

you have to raise a WidgetInputError

an example for such an error:

from zope.schema import Datetime,Bool,ValidationError
from zope.app.form.interfaces import IWidgetInputError

class FromGreaterThanTo(ValidationError):
u"""From-Date is after To-Date"""

# this is needed to adapt to a view for formlib
implements(IWidgetInputError)


Well, you can raise any error from an invariant that  
extends...zope.interface.Invalid, maybe?  The invariant interface  
says what is allowed somewhere in zope.interface.


...I suppose we could have a generic view for Invalid errors that  
simply said "This is invalid, try again"?  Doesn't seem very useful  
to me.


You are responsible for making sure you have a reasonable exception  
view of an exception you raise.  I'm inclined to think that this is a  
documentation bug at worst.


Gary
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Re: [Zope3-Users] Formlib and invariants?

[Bernd Dorn]

yes, this should really be fixed up in the default implementation of  
formlib


because interface.Invalid has no registered multiadapter to
 zope.app.form.browser.interfaces.IWidgetInputErrorView

you have to raise a WidgetInputError

an example for such an error:

from zope.schema import Datetime,Bool,ValidationError
from zope.app.form.interfaces import IWidgetInputError

class FromGreaterThanTo(ValidationError):
u"""From-Date is after To-Date"""

# this is needed to adapt to a view for formlib
implements(IWidgetInputError)




On 03.05.2006, at 20:59, mats.nordgren wrote:

I'm trying to do a join form with formlib and are getting errors  
when checking

invariants.

I have my form interface IJoinForm

class IJoinForm(Interface):
"""a join form"""

username = schema.TextLine(
title=_('User Name'),
required=True)
password = schema.Password(
title=_('Password'))
password_check = schema.Password(
title=_('Enter Password Again'))
title = schema.TextLine(
title=_('Title'))

@invariant
def checkPasswords(obj):
if obj.password != obj.password_check:
raise Invalid("Passwords do not match")

And then I have my implementation of form.Form:

class JoinMetroSite(form.Form):
form_fields = form.Fields(IJoinForm)

@form.action('Join')
def handle_join_action(self, action, data):
principal_folder = zapi.getUtility(IAuthenticatorPlugin,  
'principal')
principal = InternalPrincipal(data['username'], data 
['password'],

data['title'])
principal_folder[data['username']] = principal

My form in registered with:



When I try the join.html form I get the following error:

Traceback (innermost last):
  Module zope.publisher.publish, line 138, in publish
result = publication.callObject(request, object)
  Module zope.app.publication.zopepublication, line 161, in callObject
return mapply(ob, request.getPositionalArguments(), request)
  Module zope.publisher.publish, line 113, in mapply
return debug_call(object, args)
   - __traceback_info__: zope.app.publisher.browser.viewmeta.JoinMetroSite instance at  
0x034C9B50>

  Module zope.publisher.publish, line 119, in debug_call
return object(*args)
  Module zope.formlib.form, line 739, in __call__
return self.render()
  Module zope.formlib.form, line 733, in render
self.form_result = self.template()
  Module zope.app.pagetemplate.viewpagetemplatefile, line 83, in  
__call__

return self.im_func(im_self, *args, **kw)
  Module zope.app.pagetemplate.viewpagetemplatefile, line 51, in  
__call__

sourceAnnotations=getattr(debug_flags, 'sourceAnnotations', 0),
  Module zope.pagetemplate.pagetemplate, line 117, in pt_render
strictinsert=0, sourceAnnotations=sourceAnnotations)()
  Module zope.tal.talinterpreter, line 277, in __call__
self.interpret(self.program)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 878, in do_defineMacro
self.interpret(macro)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 926, in do_extendMacro
definingName, extending)
  Module zope.tal.talinterpreter, line 908, in do_useMacro
self.interpret(macro)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 538, in do_optTag_tal
self.do_optTag(stuff)
  Module zope.tal.talinterpreter, line 523, in do_optTag
return self.no_tag(start, program)
  Module zope.tal.talinterpreter, line 518, in no_tag
self.interpret(program)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 878, in do_defineMacro
self.interpret(macro)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 976, in do_defineSlot
self.interpret(block)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 966, in do_defineSlot
self.interpret(slot)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 878, in do_defineMacro
self.interpret(macro)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 878, in do_defineMacro
self.interpret(macro)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 976, in do_defineSlot
self.interpret(block)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 878, in do_defineMacro
self.interpret(macro)
  Module zope.tal.talinterpreter, line 352, in interpret

[Zope3-Users] Formlib and invariants?

[mats.nordgren]

I'm trying to do a join form with formlib and are getting errors when checking
invariants.

I have my form interface IJoinForm

class IJoinForm(Interface):
"""a join form"""

username = schema.TextLine(
title=_('User Name'),
required=True)
password = schema.Password(
title=_('Password'))
password_check = schema.Password(
title=_('Enter Password Again'))
title = schema.TextLine(
title=_('Title'))

@invariant
def checkPasswords(obj):
if obj.password != obj.password_check:
raise Invalid("Passwords do not match")

And then I have my implementation of form.Form:

class JoinMetroSite(form.Form):
form_fields = form.Fields(IJoinForm)

@form.action('Join')
def handle_join_action(self, action, data):
principal_folder = zapi.getUtility(IAuthenticatorPlugin, 'principal')
principal = InternalPrincipal(data['username'], data['password'],
data['title'])
principal_folder[data['username']] = principal

My form in registered with:



When I try the join.html form I get the following error:

Traceback (innermost last):
  Module zope.publisher.publish, line 138, in publish
result = publication.callObject(request, object)
  Module zope.app.publication.zopepublication, line 161, in callObject
return mapply(ob, request.getPositionalArguments(), request)
  Module zope.publisher.publish, line 113, in mapply
return debug_call(object, args)
   - __traceback_info__: 
  Module zope.publisher.publish, line 119, in debug_call
return object(*args)
  Module zope.formlib.form, line 739, in __call__
return self.render()
  Module zope.formlib.form, line 733, in render
self.form_result = self.template()
  Module zope.app.pagetemplate.viewpagetemplatefile, line 83, in __call__
return self.im_func(im_self, *args, **kw)
  Module zope.app.pagetemplate.viewpagetemplatefile, line 51, in __call__
sourceAnnotations=getattr(debug_flags, 'sourceAnnotations', 0),
  Module zope.pagetemplate.pagetemplate, line 117, in pt_render
strictinsert=0, sourceAnnotations=sourceAnnotations)()
  Module zope.tal.talinterpreter, line 277, in __call__
self.interpret(self.program)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 878, in do_defineMacro
self.interpret(macro)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 926, in do_extendMacro
definingName, extending)
  Module zope.tal.talinterpreter, line 908, in do_useMacro
self.interpret(macro)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 538, in do_optTag_tal
self.do_optTag(stuff)
  Module zope.tal.talinterpreter, line 523, in do_optTag
return self.no_tag(start, program)
  Module zope.tal.talinterpreter, line 518, in no_tag
self.interpret(program)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 878, in do_defineMacro
self.interpret(macro)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 976, in do_defineSlot
self.interpret(block)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 966, in do_defineSlot
self.interpret(slot)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 878, in do_defineMacro
self.interpret(macro)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 878, in do_defineMacro
self.interpret(macro)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 976, in do_defineSlot
self.interpret(block)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 878, in do_defineMacro
self.interpret(macro)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 538, in do_optTag_tal
self.do_optTag(stuff)
  Module zope.tal.talinterpreter, line 523, in do_optTag
return self.no_tag(start, program)
  Module zope.tal.talinterpreter, line 518, in no_tag
self.interpret(program)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 872, in do_condition
self.interpret(block)
  Module zope.tal.talinterpreter, line 352, in interpret
handlers[opcode](self, args)
  Module zope.tal.talinterpreter, line 872, in do_condition
self.interpret(block)
  Module zope.tal.talin