[docs] [issue21547] '!s' formatting documentation bug

[Eric V. Smith]

Eric V. Smith added the comment:

I suggest using whatever language explains what "u'%s' %obj" does. It's the same behavior.

>From the SO question, given:

class A(object):
    def __str__(self):
        return 'as str'

    def __unicode__(self):
        return u'as unicode'

Then:

>>> '%s' % A()
'as str'
>>> u'%s' % A()
u'as unicode'

and:

>>> '{!s}'.format(A())
'as str'
>>> u'{!s}'.format(A())
u'as unicode'

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nosy: +eric.smith

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<http://bugs.python.org/issue21547>
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