[Python-Dev] pickle and copy discrepancy

[Ethan Furman]

On 03/01/2016 03:14 AM, Serhiy Storchaka wrote:

> The difference is that the copy module sets object's state before adding
> items and key-value pairs, but the pickle module sets object's state
> after adding items and key-value pairs. If append() or __setitem__()
> depend on the state of the object, the pickling is incompatible with the
> copying.

Aren't there tests to ensure the unpickled/copied object are identical 
to the original object?

Under which circumstances would they be different?

--
~Ethan~