On Thu, 2009-12-17 at 18:11 +0000, exar...@twistedmatrix.com wrote: > On 05:40 pm, gabriel.rosse...@arimaz.com wrote: > >Hello everyone, > > > >for some reason copy.deepcopy forks great on a domish.Element on 2.5 > >but > >not in 2.6 : > > Actually, it looks like it works about equally well on either version. > While it looks like an exception was raised by deepcopy on Python 2.6, > notice that the exception was actually *ignored*. You get back a copy, > and it even seems to have all the right attributes. ;) > > The infinite recursion in deepcopy happens on Python 2.5 as well. I'm > not completely sure why it's not being reported, but it probably has to > do with tiny differences in how deepcopy works. hasattr is well known > for swallowing exceptions silently. The impressive thing is that the > error is reported at all in Python 2.6. > > A good rule of thumb is to assume that types don't support being copied > like this unless their docs explicitly state that they do. If you want > this to be supported, it's probably not too hard to implement. Feel > free to file a ticket with a patch. :)
There is an open ticket about this: http://twistedmatrix.com/trac/ticket/724 In short: it is probably a bad idea, and I'm curious about the possible useful use cases. ralphm _______________________________________________ Twisted-Python mailing list Twisted-Python@twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
