Georg Brandl ge...@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
Eric Smith e...@trueblade.com added the comment:
I agree with Georg. I think 2.x is arguably correct, and 3.1 is broken.
It looks like this has already been fixed in 3.2. It's not immediately obvious
why that is, I'll have to look at the code more than the quick glance I just
gave it.
Python
Arfrever Frehtes Taifersar Arahesis arfrever@gmail.com added the comment:
It's probably a duplicate of issue #1583863.
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Eric Smith e...@trueblade.com added the comment:
Yes, that's the cause, thanks for finding that issue. It's actually fixed in
3.1.2, I just hadn't updated my local copy.
Closing, since there's nothing to fix here. The 2.6 behavior is correct, and
the 3.x behavior that was broken has been
Steven D'Aprano steve+pyt...@pearwood.info added the comment:
I've assumed that the documentation is correct, and that %s%obj should call
__str__ for unicode objects as well as everything else.
Attached in a test file.
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Added file:
Changes by Eric Smith e...@trueblade.com:
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Changes by Florent Xicluna florent.xicl...@gmail.com:
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nosy: +flox
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New submission from Steven D'Aprano steve+pyt...@pearwood.info:
String interpolation % operates on unicode strings directly without calling the
__str__ method. In Python 2.5 and 2.6:
class K(unicode):
... def __str__(self): return Surprise!
...
u%s % K(some text)
u'some text'
but
Changes by Ezio Melotti ezio.melo...@gmail.com:
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components: +Interpreter Core
nosy: +ezio.melotti
priority: - normal
stage: - test needed
type: - behavior
versions: +Python 2.7, Python 3.2 -Python 2.5
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