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[3.14] gh-106318: Add example for str.format() (GH-137018) (#141904)

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Co-authored-by: Adorilson Bezerra <adorilson@gmail.com>
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Doc/library/stdtypes.rst
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@ -1994,10 +1994,16 @@ expression support in the :mod:`re` module).
``{}``. Each replacement field contains either the numeric index of a
positional argument, or the name of a keyword argument. Returns a copy of
the string where each replacement field is replaced with the string value of
the corresponding argument.
the corresponding argument. For example:
.. doctest::
>>> "The sum of 1 + 2 is {0}".format(1+2)
'The sum of 1 + 2 is 3'
>>> "The sum of {a} + {b} is {answer}".format(answer=1+2, a=1, b=2)
'The sum of 1 + 2 is 3'
>>> "{1} expects the {0} Inquisition!".format("Spanish", "Nobody")
'Nobody expects the Spanish Inquisition!'
See :ref:`formatstrings` for a description of the various formatting options
that can be specified in format strings.