Customizing PSC

Maurits van Rees m.van.rees at
Mon Aug 13 16:00:31 UTC 2007

Emyr Thomas, on 2007-08-13:
>     def appname():
>         def get(self):
>             return self.mapping['appname']
>         def set(self, v):
>             self.mapping['appname'] = v
>         return property(get, set)
>     appname = appname()

I think you need to do "appname = self.appname()" here.  Or "appname =
appname(self)".  But I tend to do it like this:

    def __get_appname(self):
        return self.mapping.get('appname', 'default string')
    def __set_appname(self, v):
        if not isinstance(v, str): # or unicode, whatever
            v = float(v)
        self.mapping['appname'] = v
    appname = property(__get_appname, __set_appname)

(partly copied from another project, so I may have overlooked something)

> Also, when zope starts up, I get this warning:
> 2007-08-13 10:24:09 WARNING Init Class 
> Products.PloneSoftwareCenter.content.release.PSCRelease has a security 
> declaration for nonexistent method 'appname'

The problem here is that this class implements your interface so due
to the zcml it has a security declaration for 'appname', but it does
not have a method 'appname' as you define it as an attribute, which
makes it not available on Zope startup.  This can safely be ignored.

Maurits van Rees | [NL]
            Work |
"Do not worry about your difficulties in computers,
 I can assure you mine are still greater."

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