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| -rw-r--r-- | Doc/library/stdtypes.rst | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst index ebe7b7604c..0ac870be21 100644 --- a/Doc/library/stdtypes.rst +++ b/Doc/library/stdtypes.rst @@ -1042,9 +1042,17 @@ functions based on regular expressions. Similar to ``str.format(**mapping)``, except that ``mapping`` is used directly and not copied to a :class:`dict` . This is useful - if for example ``mapping`` is a dict subclass. + if for example ``mapping`` is a dict subclass: + + >>> class Default(dict): + ... def __missing__(self, key): + ... return key + ... + >>> '{name} was born in {country}'.format_map(Default(name='Guido')) + 'Guido was born in country' + + .. versionadded:: 3.2 - .. versionadded:: 3.2 .. method:: str.index(sub[, start[, end]]) |