[Zope] Error Value: can't pickle function objects

Alec Mitchell apm13 at columbia.edu
Fri May 28 12:47:46 EDT 2004

On Friday 28 May 2004 08:36 am, Mohamed Lrhazi wrote:
> What does that error mean?
> In my main class I have :
> main_page=PageTemplateFile('zpt/main_page.zpt',globals())
> main_page._owner=None
>   def index_html(self,REQUEST=None):
> 	"""our main page... Enter here!"""
> 	if REQUEST is not None:
> 		if REQUEST.has_key('YSURLARGS'):
> 			if REQUEST['YSURLARGS'][0] == 'domain':
> 				self.domain = self.ddb.getDomain(REQUEST['YSURLARGS'][1])
> 				self.domainTitle=self.domain.getHTMLDomainName()
> 			else:
> 				pass
> 		else:
> 			pass
> 	else:
> 		pass
> 	return self.main_page(self,REQUEST)
> And this results in:
> Site Error
> An error was encountered while publishing this resource.
> Error Type: TypeError
> Error Value: can't pickle function objects

Interesting, in my experience (as noted in a very recent post), this means 
that you are trying to add a function/method as an attribute of an class 
instance stored in the ZODB.  Looking at your code, I see nothing obvious 
that youd indicate such behavior, unless the getDomain or getHTMLDomainName 
calls return functions (that seems unlikely judging by their names).  Perhaps 
some other code from this class is at fault?

As a side note, in the past I believe that was able to store functions as 
instance attributes in the ZODB, without any pickling errors.  Perhaps in the 
switch to Zope 2.7, or more likely Python 2.3 this changed.  My current 
suspicion is that it is related to the ZODB's inability to deal properly with 
"new style" classes.  Sorry I can't be of any more help.

Good luck,
Alec Mitchell

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