Hello Laurence, On Fri, 2011-07-22 at 13:57 +0100, Laurence Rowe wrote: > No, there are issues. Take this example: > > >>> class ITest(Interface): > ... title = schema.TextLine() > ... > >>> ITest.names > <bound method InterfaceClass.names of <InterfaceClass __main__.ITest>> > >>> ITest.names() > ['title'] > >>> ITest.description = schema.Text() > >>> ITest.names() > ['title'] > > The fields on an interface are not stored as attributes, but are > accessible using item access, e.g: ITest['title']. You cannot assign > that way though: > > >>> ITest['description'] = schema.TextLine() > Traceback (most recent call last): > File "<console>", line 1, in <module> > TypeError: 'InterfaceClass' object does not support item assignment > > Adding to an interface requires messing with the > '_InterfaceClass__attrs' attribute of the dictionary and is > discouraged.
Thanks for enlightening me with this wonderful explanation. As Jacob mentioned, list(INode) in debug shell was very handy to debug. -- Joshua Immanuel HiPro IT Solutions Private Limited http://hipro.co.in
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