[Zope] Return of Zoo guestbook problem.

[Ignacio Valdes]

Hello all,

I'm trying to tackle the Zoo GuestBook example from the Zope book:
http://www.zope.org/Members/michel/ZB/SimpleExamples.dtml

I've got it all working except the last part in the AddEntry python
script. I now have Zope 2.3.1 installed on my ISP's system. The script
craters on the first line which reads:

      """
      Create a guest book entry.
      """
      # create a unique document id
      id='entry_%d' % len(context.objectIds())

With the following error message:

Zope Error

             Zope has encountered an error while publishing this
resource.

             Error Type: NameError
             Error Value: context



             Troubleshooting Suggestions

                  This resource may be trying to reference a nonexistent
object or variable context.
                  The URL may be incorrect.
                  The parameters passed to this resource may be
incorrect.
                  A resource that this resource relies on may be
encountering an error.

             For more detailed information about the error, please refer
to the HTML source for this page.

             If the error persists please contact the site maintainer.
Thank you for your patience.


Traceback (innermost last):
  File /home/zope/zope5/lib/python/ZPublisher/Publish.py, line 223, in
publish_module
  File /home/zope/zope5/lib/python/ZPublisher/Publish.py, line 187, in
publish
  File /home/zope/zope5/lib/python/Zope/__init__.py, line 221, in
zpublisher_exception_hook
    (Object: Traversable)
  File /home/zope/zope5/lib/python/ZPublisher/Publish.py, line 171, in
publish
  File /home/zope/zope5/lib/python/ZPublisher/mapply.py, line 160, in
mapply
    (Object: addEntryAction)
  File /home/zope/zope5/lib/python/ZPublisher/Publish.py, line 112, in
call_object
    (Object: addEntryAction)
  File /home/zope/zope5/lib/python/OFS/DTMLMethod.py, line 189, in
__call__
    (Object: addEntryAction)
  File /home/zope/zope5/lib/python/DocumentTemplate/DT_String.py, line
538, in __call__
    (Object: addEntryAction)
  File /home/zope/zope5/lib/python/DocumentTemplate/DT_Util.py, line
334, in eval
    (Object: addEntry(guest_name, comments))
    (Info: guest_name)
  File <string>, line 0, in ?
  File
/home/zope/zope5/lib/python/Products/PythonMethod/PythonMethod.py, line
168, in __call__
    (Object: addEntry)
    (Info: (('Anonymous', ''), {}, None))
  File <string>, line 6, in addEntry
NameError: (see above)