[issue21720] "TypeError: Item in ``from list'' not a string" message

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Given that the automated cherry-pick failed, I'd consider a 3.6 backport nice to have, but definitely not essential.

My rationale for that is that "from __future__ import unicode_literals" makes it fairly easy to stumble over the 2.7 variant of this error message, but we're not aware of a similarly implicit way of encountering the 3.x variant.

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stage: patch review -> backport needed

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