On Thu, Apr 14, 2016 at 07:38:31PM +0000, Albert-Jan Roskam wrote:
> Hi,
>
> Lately I have been using the "mutable namedtuple" shown below a lot.
> I found it somewhere on StackOverflow or ActiveState or something. In
> its original form, it only had an __init__ method. I noticed that
> copying Record objects sometimes failed.
Failed how?
Given how simple the class looks, I wonder whether that's a bug in copy.
Apart from a fancy __str__ method, there's practically nothing to it!
So I took your Record class, stripped out the __copy__ and __deepcopy__
methods, created a slightly complex instance, and tried copying it:
d = Record(spam=23, ham=42, eggs=[], cheese={})
d.cheese[1] = None
d.cheese[2] = ['a', 'b', 'c']
d.eggs.append(100)
d.eggs.append(200)
d.eggs.append(d)
d.eggs.append(d.cheese)
from copy import copy, deepcopy
copy(d)
deepcopy(d)
and both appeat to work correctly. So perhaps you ought to look more
carefully at the copying failure?
--
Steve
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
https://mail.python.org/mailman/listinfo/tutor
