bidict imcompatible with deepcopy and pickle

[uduse]

import copy
from bidict import bidict
d = bidict({0: 1, 2: 3})
d2 = copy.deepcopy(d)
x = d2.inv.inv

This raises:

~/Library/...
    169     def inv(self):
    170         """Alias for :attr:`inverse`."""
--> 171         return self.inverse
    172 
    173     def __getstate__(self):

~/Library/...
    159             return self._inv
    160         # Otherwise a weakref is stored in self._invweak. Try to get a strong ref from it.
--> 161         inv = self._invweak()
    162         if inv is not None:
    163             return inv

AttributeError: _invweak

In addition, this also raises the same error:

import pickle
from bidict import bidict
d = bidict({0: 1, 2: 3})
pickle.loads(pickle.dumps(d)).inv.inv

[jab]

Thank you for reporting @uduse. Just fixed. Would you like to test it on latest master before I publish a new release with the fix?

[uduse]

@jab works like a charm, thanks a lot for the quick fix!

[jab]

Thanks for confirming @uduse! The fix is now released in v0.18.1.

Hope you're finding bidict useful. If you'd like to share anything else about you and your use case, I'm always interested to better understand who is using bidict and how they're using it, how it could meet their needs better, and how they could more easily contribute if interested.

You can subscribe to new release notifications at https://libraries.io/pypi/bidict, and/or join the Gitter chat, where I announce new releases and solicit feedback on proposed changes. By default Gitter will email you about mentions you missed, but the chat room is very low activity, and it's easy to change your notification settings too.

Thanks again for reporting this issue, and look forward to crossing paths again.