in a pickle
On 03/06/2019 10:30 AM, duncan smith wrote:
> I've been trying to figure out why one of my classes can be
> pickled but not unpickled. (I realise the problem is probably with the
> pickling, but I get the error when I attempt to unpickle.)
> A relatively minimal example is pasted below.
> --> import pickle
> --> class test(dict):
> ... def __init__(self, keys, shape=None):
> ... self.shape = shape
> ... for key in keys:
> ... self[key] = None
> ... def __setitem__(self, key, val):
> ... print (self.shape)
> ... dict.__setitem__(self, key, val)
> --> x = test([1,2,3])
> --> s = pickle.dumps(x)
> --> y = pickle.loads(s)
> Traceback (most recent call last):
> File "<pyshell#114>", line 1, in <module>
> y = pickle.loads(s)
> File "<pyshell#111>", line 8, in __setitem__
> print (self.shape)
> AttributeError: 'test' object has no attribute 'shape'
It seems to me the problem only exists because you are trying to print `self.shape` -- stop printing it, and everything works normally.
What problem are you actually trying to solve?