Eric Smith <[email protected]> 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 3.1.1+ (release31-maint:77299, Jan 4 2010, 08:27:32)
[GCC 4.1.2 20070626 (Red Hat 4.1.2-13)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> class MyStr(str):
... def __str__(self): return "Surprise!"
...
>>> '%s' % MyStr('foo')
'foo'
>>> '{}'.format(MyStr('foo'))
'Surprise!'
Python 3.2a0 (py3k:80525M, Apr 27 2010, 05:19:53)
[GCC 4.1.2 20070626 (Red Hat 4.1.2-13)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> class MyStr(str):
... def __str__(self): return "Surprise!"
...
>>> '%s' % MyStr('foo')
'Surprise!'
>>> '{}'.format(MyStr('foo'))
'Surprise!'
----------
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<http://bugs.python.org/issue8128>
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