Hi Aleksander, Thanks for your response. And thanks to Benji, too, for replying with the informative link. More below...
> From zope3-users On Behalf Of Aleksander Kowalczyk > > On 4/12/07, Giovannetti, Mark <[EMAIL PROTECTED]> wrote: > > Hi list, > > Hope everyone's having a splendid day/evening/whatever. > > I've encountered a strange error. I have two chunks > of nearly identical code below. The only difference > is the first "if" statement. One has: > > if context: > > the other has: > > if context is not None > > The first fails to be true even if context is not None. > This can be seen by the output from the logs showing the > context variable as: > > Possibly a context is a container-like object. > For containers operation > "if context" is equal to "if len(context) > 0". So even if > context is not None, it still may be False if the container > does not contain any elements. > This occurred to me at about the same time I read your message. The context is indeed a container (which happened to be empty), thus the false evaluation as you suggest. Another nugget of useful python/zope programming knowledge! Regards Mark _______________________________________________ Zope3-users mailing list [EMAIL PROTECTED] http://mail.zope.org/mailman/listinfo/zope3-users
