Message 314116 - Python tracker

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I think the main concern here is ease in portability coupled with the incorrectness of the current message (pointed out in https://bugs.python.org/issue31550#msg302738)

For instance it was consistent in 2.7.1, but not later on in the 2.7.x tree.  *And* it's different than python3 (for no good reason?)

The message is misleading as well, it's not looking for __getitem__ on the instance but on the type.