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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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This commit is contained in:
Georg Brandl 2010-08-02 20:32:03 +00:00
parent 3edccce7ef
commit 1858b6f2dc
1 changed files with 10 additions and 4 deletions
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14
Doc/library/constants.rst
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@ -3,7 +3,6 @@ Built-in Constants
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 @@ A small number of constants live in the built-in namespace. They are:
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
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