Mirror
/
cpython
mirror of https://github.com/python/cpython
4
1
Fork 0
Code Issues Releases Wiki Activity

Added a placeholder for str.format_map, as discussed with Raymond. My prose is horrible, some cleanup is required.

This commit is contained in:
Eric Smith 2011-01-28 20:23:25 +00:00
parent e180d3953f
commit 598b513a5d
1 changed files with 20 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
Doc/whatsnew/3.2.rst
View File

@ -442,6 +442,26 @@ Some smaller changes made to the core Python language are:
(Suggested by Mark Dickinson and implemented by Eric Smith in :issue:`7094`.)
.. XXX * :meth:`str.format_map` was added, allowing an arbitrary mapping object
to be passed in to :meth:`str.format`. `somestring.format_map(mapping)`
is similar to `somestring.format(**mapping)`, except that in the latter
case `mapping` is convert to a `dict` and in the former case `mapping`
is used without modification. For example, to use a `defaultdict` with
formatting::
>>> from collections import defaultdict
>>> mapping = defaultdict(lambda: 'Europe', name='Guido')
>>> '{name} was born in {country}'.format_map(mapping)
'Guido was born in Europe'
This is similar to %-formatting with a single mapping argument::
>>> '%(name)s was born in %(country)s' % mapping
'Guido was born in Europe'
(Suggested by Raymond Hettinger and implemented by Eric Smith in
:issue:`6081`.)
* The interpreter can now be started with a quiet option, ``-q``, to suppress
the copyright and version information from being displayed in the interactive
mode. The option can be introspected using the :attr:`sys.flags` attribute::