From: Raymond Hettinger Date: Tue, 15 Jan 2008 21:22:47 +0000 (+0000) Subject: Fix-up half-written paragraph in the docs X-Git-Tag: v2.6a1~597 X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=e805782b537cce4a1cf1d15b554b0895dc67123a;p=python Fix-up half-written paragraph in the docs --- diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst index de9bcbfae2..cde114cd24 100644 --- a/Doc/library/collections.rst +++ b/Doc/library/collections.rst @@ -535,13 +535,9 @@ faster versions that bypass error-checking:: def _replace(self, _map=map, **kwds): return self._make(_map(kwds.get, ('x', 'y'), self)) -Note, subclasses should set ``__slots__`` to an empty tuple so that -an instance dictionary will not be created and the memory overhead -will be kept to zero. - -Note, subclasses should set ``__slots__`` to an empty tuple. This -reduces memory usage by - +The subclasses shown above set ``__slots__`` to an empty tuple. This keeps +the named tuples from having per-instance dictionaries, so they will +continue to be lightweight and require no more memory than regular tuples. Subclassing is not useful for adding new, stored fields. Instead, simply create a new named tuple type from the :attr:`_fields` attribute::