[Tutor] class data

[fleet@teachout.org]

OK.  Using pickle and the associated example, I was able to save the class
and restore it.  Either none of the data was saved or I don't know how to
access it when the class is restored.

I don't see the utility in 'pickling' a class.  It's already saved in a
module (addrbook.py).  I haven't tried it; but I suspect if I pickled the
class, then deleted the addrbook.py module, I would no longer be able to
unpickle the class.  Or did I miss something?

				- fleet -

On Sun, 2 Dec 2001, Danny Yoo wrote:

> Ah!  Take a look at the 'pickle' module:
>
>     http://python.org/doc/lib/module-pickle.html
>
> 'pickle' knows how to deal with instances, and will properly allow you to
> save data structures as a byte stream.
>
> It doesn't work on pathological cases (like C extension modules or files),
> at least, not without a bit of hacking with the 'copy_reg' module.
>
> Try it out, and if you have problems with it, please email the list, and
> we can ferment an example.
>