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What could generate the following behavior ? >>> print str(msg) my message >>> print unicode(msg) my message But: >>> print '%s' % msg another message More info: my msg object is inherited from unicode . the methods __str__ / __unicode__ / __repr__ methods were overridden to return the string 'my message' . the msg object was initialised with the string 'another message' . this is running on python 2.5 the variable msg was not changed between the tests this is actually real doctest that is really giving these results. I would like an solution that matches this doctest, with minimal fuss (especially around the actual inheritance): >>> print '%s' % msg my message Thanks for all suggestions. I don't feel this will help more, but for curious readers (and adventurous pythonist), here's the implementation of the object: class Message(zope.i18nmessageid.Message): def __repr__(self): return repr(zope.i18n.interpolate(self.default, self.mapping)) def __str__(self): return zope.i18n.interpolate(self.default, self.mapping) def __unicode__(self): return zope.i18n.interpolate(self.default, self.mapping) This is how we create the object msg: >>> msg = Message('another message', 'mydomain', default='my message') Zope packages version and code used are: zope.i18n-3.4.0 ( interpolation() method code ) zope.i18nmessageid-3.4.3 (<a href="http://svn.zope.org/zope.i18nmessageid/tags/3.4.3/src/zope/i18n

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