[issue8128] String interpolation with unicode subclass fails to call __str__

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

In Python 2.x, __unicode__ is called instead of __str__.  Whether that's "correct" behavior, I'm not sure, but at least it is consistent with "{}".format(K()).

In Python 3.x, __unicode__ doesn't exist and __str__ isn't called; but for "{}".format(K()), it is.  Therefore I think here a fix should be made in any case.

Benjamin, what do you think?

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assignee:  -> benjamin.peterson
nosy: +benjamin.peterson, georg.brandl

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