When pickling a Nonetype the loaded value is changed

[shadetree01010100]

>>> import safepickle
>>> import pickle
>>>
>>> data = {None: True}
>>>
>>> with open('unsafe.dat', 'wb') as f:
...     pickle.dump(data, f)
...
>>> with open('safe.dat', 'w+') as f:
...     safepickle.dump(data, f)
...
>>> with open('unsafe.dat', 'rb') as f:
...     unsafe=pickle.load(f)
...
>>> with open('safe.dat', 'r') as f:
...     safe=safepickle.load(f)
...
>>> safe == data
False
>>> unsafe == data
True
>>> safe
{'null': True}
>>>

The behavior of safepickle is not the same as pickle when saving Nonetype, what you load is not what you saved. In this case the key None has been changed to "null" when using safepickle.

[f1401martin]

This issue had been fixed in Aug25 (Avoid generating dictionaries with potentially un-hashable keys)