Merged revisions 83567 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/release27-maint
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r83567 | georg.brandl | 2010-08-02 22:32:03 +0200 (Mo, 02 Aug 2010) | 9 lines
Merged revisions 83552 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k
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r83552 | georg.brandl | 2010-08-02 21:36:36 +0200 (Mo, 02 Aug 2010) | 1 line
#9438: clarify that constant names also cannot be assigned as attributes.
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diff --git a/Doc/library/constants.rst b/Doc/library/constants.rst
index b02e04e..80e792c 100644
--- a/Doc/library/constants.rst
+++ b/Doc/library/constants.rst
@@ -3,7 +3,6 @@
A small number of constants live in the built-in namespace. They are:
-
.. data:: False
The false value of the :class:`bool` type.
@@ -39,16 +38,23 @@
Special value used in conjunction with extended slicing syntax.
- .. XXX Someone who understands extended slicing should fill in here.
-
.. data:: __debug__
This constant is true if Python was not started with an :option:`-O` option.
- Assignments to :const:`__debug__` are illegal and raise a :exc:`SyntaxError`.
See also the :keyword:`assert` statement.
+.. note::
+
+ The names :data:`None` and :data:`__debug__` cannot be reassigned
+ (assignments to them, even as an attribute name, raise :exc:`SyntaxError`),
+ so they can be considered "true" constants.
+
+ .. versionchanged:: 2.7
+ Assignments to ``__debug__`` as an attribute became illegal.
+
+
Constants added by the :mod:`site` module
-----------------------------------------