[issue30597] Show expected input in custom "print" error message

[Nick Coghlan]

Nick Coghlan added the comment:

A note regarding the applicable versions: for the original custom warning, we decided it made sense to change it in a maintenance release, since the generic syntax error really was incredibly cryptic, and we wanted to get the update into the hands of users as quickly as possible.

For this change, it makes more sense to treat it as a normal enhancement, since potentially saving folks a trip to Stack Overflow is a nice improvement, but not a "we should change the reported exception details in a maintenance release" level change.

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<http://bugs.python.org/issue30597>
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