Hi people, I tried to save a method reference to the ZODB (see below at #####). The nop method acts as default method to be called in do_something() if an other module using the class does not register itself a method. Zope 2.3.0 (and also 2.2.4) prints the error shown below which I do not understand. I'am using Zope under NT4SP6us. The same error occures in register_method(). Do I do something wrong? Or is there a bug in Zope? Or is this kind of thing not possible with the ZODB? Thanks in advance, Greg P.S.: As it seems my approach is correct (from the python view), as the code snipped at the end of the e-mail shows. But if there is somebody on the list who knows a better solution, please let me know! #------------------------- code fragment ------------------------- import Globals from Globals import Persistent, Acquisition import AccessControl import OFS class Calendar(OFS.SimpleItem.SimpleItem): """ a calendar object """ def nop(self, beg, end): return '' def __init__(self, parentFolder, id): self.method = self.nop ##### <-- if I clear this line the error ##### disappears self.id=str(id) self.title='' parentFolder._setObject(id, self) return parentFolder._getOb(id) # as in OSF/Folder.py def register_method(self, method): self.method = method def do_something(): ... value = self.method(start_date, end_date) ... #------------------------- zope error message ------------------------- Zope Error Zope has encountered an error while publishing this resource. Error Type: cPickle.PicklingError Error Value: Cannot pickle objects. Troubleshooting Suggestions 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 D:\prog\zope\lib\python\ZPublisher\Publish.py, line 222, in publish_module File D:\prog\zope\lib\python\ZPublisher\Publish.py, line 187, in publish File D:\prog\zope\lib\python\Zope\__init__.py, line 221, in zpublisher_exception_hook File D:\prog\zope\lib\python\ZPublisher\Publish.py, line 175, in publish File D:\prog\zope\lib\python\Zope\__init__.py, line 235, in commit File D:\prog\zope\lib\python\ZODB\Transaction.py, line 252, in commit File D:\prog\zope\lib\python\ZODB\Connection.py, line 358, in commit (Info: (('Products.HOOP.Calendar', 'Calendar'), '\000\000\000\000\000\000\024=', '')) cPickle.PicklingError: (see above) #------------------------- python shell example -------------------------

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class gaga: ... def nop(self): pass ... def __init__(self): ... self.m = self.nop ... def get(self): ... return self.m ... g= gaga() g <__main__.gaga instance at 7e8a80> g.get() <method gaga.nop of gaga instance at 7e8a80>

_______________________________________________________ Grégoire Weber Rigistr. 31 CH-8006 Zürich Switzerland phone: +41-(0)1-361 66 11 mobile: +41-(0)79-44 11 457 mailto:gregoire.weber@switzerland.org Gregi's Handy-Handhabung: http://www.topics.ch/greg/ghh