Arnaud Delobelle escreveu: > On Mar 17, 11:48 pm, Paulo da Silva <[EMAIL PROTECTED]> wrote: >> Arnaud Delobelle escreveu:> On Mar 17, 9:31 pm, Paulo da Silva <[EMAIL >> PROTECTED]> wrote: > > [snip] > >> Thanks. This works exactly the way you wrote. >> Yet I am misunderstanding something. Can't pickle "see" that being >> MyDate derived from date it also has to look at variables from date? >> When do I need to do this? I am using pickle with a lot more complex >> classes without this problem. > > Without the MyDate.__reduce__ method, Python uses the > datetime.date.__reduce__ method to pickle your MyDate instances, then > it uses MyDate.__new__ to unpickle them. But your MyDate.__new__ > method does not understand the format of a pickled date. You could > also change the MyDate.__new__ method so that it does understand it, > but it wouldn't be that easy as you want it to accept a string, and > this is the format that dates are pickled in. > > -- > Arnaud > > >
I see now. I need to read a little further about this stuff as soon as I get some time to do it. Thanks Arnaud. -- http://mail.python.org/mailman/listinfo/python-list
