Make ObjectProxy Picklable about wrapt HOT 6 OPEN

If one assumes that the only things one should pickle from the proxy are the special 'self' prefixed attributes, since anything else is meant to be proxied through to the object, the list of attributes to use in __reduce__() could be calculated using:

filter(lambda _: _[0].startswith('_self_'), vars(self).items())

So long as you pick the attribute names as well, you have that when restoring it.

Would that work for what you have in mind?

from wrapt.

You may even be able to avoid __setstate__() if in __reduce__() the third argument is supplied as a dict.

dict(filter(lambda _: _[0].startswith('_self_'), vars(a).items()))

from wrapt.

Are you using Python 3?

I don't even get the same error as you for the initial example. I am using Python 2.7.

  File "/Users/graham/Projects/wrapt/venv/lib/python2.7/copy_reg.py", line 70, in _reduce_ex
    raise TypeError, "can't pickle %s objects" % base.__name__
TypeError: can't pickle int objects

Supplying a __reduce__() doesn't help as can't get past the above.

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Yes to all of the above :) vars is a good idea, didn't think of that. I think that would solve the problem.

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Did you try your examples you had with vars() and get something actually working? My initial attempt failed as per above. I haven't had a chance to dig deeper yet.

from wrapt.

Sorry about the late reply but you're right, it still fails. Perhaps an attribute list would work? At least in my case I don't use _self_xxx that often anyway, so the overhead is not that high.

from wrapt.