Kevin Funk <kf...@kde.org> added the comment:

I just ran into this, under Python 3.6.

IMHO, the error message should be improved, even when the mode was not passed 
explicitly.

Can someone reopen this?

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nosy: +kfunk

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue8978>
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