From: Raymond Hettinger <python@rcn.com>
Date: Thu, 15 Nov 2007 22:39:34 +0000 (+0000)
Subject: Add example for use cases requiring default values.
X-Git-Tag: v2.6a1~1051
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=bc693491eb357d5683473c22af3db867b4c0141d;p=thirdparty%2FPython%2Fcpython.git

Add example for use cases requiring default values.
---

diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index 89885abd7659..bdc0b86a5917 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -492,6 +492,15 @@ the :meth:`__repr__` method:
     >>> Point(x=10, y=20)
     Point(10.000, 20.000)
 
+Default values can be implemented by starting with a prototype instance
+and customizing it with :meth:`__replace__`:
+
+::
+
+    >>> Account = namedtuple('Account', 'owner balance transaction_count')
+    >>> model_account = Account('<owner name>', 0.0, 0)
+    >>> johns_account = model_account.__replace__(owner='John')
+
 .. rubric:: Footnotes
 
 .. [#] For information on the star-operator see