[Python-checkins] r83278 - in python/branches/release31-maint: Doc/library/functions.rst

[mark.dickinson]

Author: mark.dickinson
Date: Fri Jul 30 15:13:54 2010
New Revision: 83278

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/release31-maint/   (props changed)
   python/branches/release31-maint/Doc/library/functions.rst

Modified: python/branches/release31-maint/Doc/library/functions.rst
==============================================================================
--- python/branches/release31-maint/Doc/library/functions.rst	(original)
+++ python/branches/release31-maint/Doc/library/functions.rst	Fri Jul 30 15:13:54 2010
@@ -961,6 +961,13 @@
    The return value is an integer if called with one argument, otherwise of the
    same type as *x*.
 
+   .. 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: