Array of objects lost in unpickling

[Bahadir]

Hi,

I have a class:

class second:
a = None
b = None

class first:
array = []

I populate the array in first class with instances of second, then
save by:

shelve = shelve.open(),
shelve["first"] = myfirst
shelve.close()

When I reopen the shelve from another script, the first class is
there, but array has no elements. If I reopen the shelve in the same
script right after shelve.close(), the elements are there.

Also there are no errors printed out.

Any idea why the array of instances are lost?

Thanks,

Bahadir

 

[Jon Clements]

Hi,

I have a class:

class second:
    a = None
    b = None

class first:
    array = []

I populate the array in first class with instances of second, then
save by:

shelve = shelve.open(),
shelve["first"] = myfirst
shelve.close()

When I reopen the shelve from another script, the first class is
there, but array has no elements. If I reopen the shelve in the same
script right after shelve.close(), the elements are there.

Also there are no errors printed out.

Any idea why the array of instances are lost?

Thanks,

Bahadir

You most likely want 'array' to be an instance level and not class
level attribute.

class first(object):
def __init__(self):
self.array = []

myfirst = first()
myfirst.array.append(23423)

etc...

hth,
Jon.

 

[Bahadir]

Hi,

I have a class:

class second:
    a = None
    b = None

class first:
    array = []

I populate the array in first class with instances of second, then
save by:

shelve = shelve.open(),
shelve["first"] = myfirst
shelve.close()

When I reopen the shelve from another script, the first class is
there, but array has no elements. If I reopen the shelve in the same
script right after shelve.close(), the elements are there.

Also there are no errors printed out.

Any idea why the array of instances are lost?

Bahadir

You most likely want 'array' to be an instance level and not class
level attribute.

class first(object):
    def __init__(self):
        self.array = []

myfirst = first()
myfirst.array.append(23423)

etc...

hth,
Jon.

Hmm, OK. New to python. Got it. Thanks a lot!

Bahadir