On Apr 17, 10:13 am, Reckoner <recko...@gmail.com> wrote: > I have a large class that is a child of list. I need to pickle it, but > it's not working. For example, I have reduced it to the following: > > class Mylist(list): > def __init__(self,x=[]): > list.__init__(self,x) > > and I cannot even get this to pickle right. > > >> w=Mylist([1,2,3]) > >> dumps(w) > > PicklingError: Can't pickle <class '__main__.p'>: attribute lookup > __main__.p fa > iled > > I'm using python 2.5 on win32. > > any help appreciated.
It worked for me. Wild guess: you've defined Mylist in a module (or, rather, you defined class p in an module and assigned Mylist to it), but you are exec'ing the module rather than importing it, ostensibly because importing a module won't load any changes you've made into the interpreter. Well, doing that will cause funny things to happen when pickling. If you're doing that, consider the reload function instead (although it has it's own problems). I'd highly recommend against pickling an instance of a class that isn't defined in, and loaded from, a regular module. Don't pickle instances of classes defined at the interpreter or through exec. Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
