python persistence

[castironpi at gmail.com]

On Mar 31, 7:14 pm, 7stud <bbxx789_0... at yahoo.com> wrote:
> On Mar 31, 5:31 pm, castiro... at gmail.com wrote:
>
> > Can you have a Python object stored entirely on disk?
>
> import cPickle as cp
>
> class Dog(object):
>     def __init__(self, name):
>         self.name = name
>
> d = Dog("Spot")
>
> f = open("data.txt", "w")
> cp.dump(d, f)
> f.close()
>
> f = open("data.txt")
> stored_obj = cp.load(f)
> print stored_obj.name
>
> --output:--
> Spot

>>> import pickle
>>> pickle.loads( pickle.dumps( type('None',(),{}) ) )
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Programs\Python\lib\pickle.py", line 1303, in dumps
    Pickler(f, protocol).dump(obj)
  File "C:\Programs\Python\lib\pickle.py", line 221, in dump
    self.save(obj)
  File "C:\Programs\Python\lib\pickle.py", line 283, in save
    f(self, obj) # Call unbound method with explicit self
  File "C:\Programs\Python\lib\pickle.py", line 697, in save_global
    (obj, module, name))
pickle.PicklingError: Can't pickle <class '__main__.None'>: it's not
found as __
main__.None
>>>