[issue6477] Pickling of NoneType raises PicklingError

[July Tikhonov]

July Tikhonov <july.tikh at gmail.com> added the comment:

No, my program failed on this. It was not a big problem to manage this, 
but I think it is a bug. And it isn't documented (or I can't find it).

Other built-in types have no such problem. Is there something special 
with NoneType?

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<http://bugs.python.org/issue6477>
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