[Python-checkins] r83279 - in python/branches/release27-maint: Doc/library/functions.rst
mark.dickinson
python-checkins at python.org
Fri Jul 30 15:16:08 CEST 2010
Author: mark.dickinson
Date: Fri Jul 30 15:16:07 2010
New Revision: 83279
Log:
Merged revisions 83277 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k
........
r83277 | mark.dickinson | 2010-07-30 14:13:02 +0100 (Fri, 30 Jul 2010) | 1 line
Add note about surprising behaviour from round function.
........
Modified:
python/branches/release27-maint/ (props changed)
python/branches/release27-maint/Doc/library/functions.rst
Modified: python/branches/release27-maint/Doc/library/functions.rst
==============================================================================
--- python/branches/release27-maint/Doc/library/functions.rst (original)
+++ python/branches/release27-maint/Doc/library/functions.rst Fri Jul 30 15:16:07 2010
@@ -1095,6 +1095,14 @@
example, ``round(0.5)`` is ``1.0`` and ``round(-0.5)`` is ``-1.0``).
+ .. note::
+
+ The behavior of :func:`round` for floats can be surprising: for example,
+ ``round(2.675, 2)`` gives ``2.67`` instead of the expected ``2.68``.
+ This is not a bug: it's a result of the fact that most decimal fractions
+ can't be represented exactly as a float. See :ref:`tut-fp-issues` for
+ more information.
+
.. function:: set([iterable])
:noindex:
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