overriding __str__ does not work on python 3.6

[jangeador]

The str method on the Attachment model is not getting interpolated is returning a literal {username} attached {filename}

This model method:

    def __str__(self):
        return _('{username} attached {filename}') % {
            'username': self.creator.get_username(),
            'filename': self.attachment_file.name
        }

[bartTC]

should be good, please try it again.

[jangeador]

Oh, I was working on it as well. You might want to add the test from my PR #48 it tests that str method.

[jangeador]

Thanks for getting on that so quickly by the way. You're awesome!