Merged revisions 83552 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ 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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@ -3,7 +3,6 @@ Built-in Constants
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A small number of constants live in the built-in namespace. They are:
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.. data:: False
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The false value of the :class:`bool` type.
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@ -39,16 +38,23 @@ A small number of constants live in the built-in namespace. They are:
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Special value used in conjunction with extended slicing syntax.
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.. XXX Someone who understands extended slicing should fill in here.
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.. data:: __debug__
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This constant is true if Python was not started with an :option:`-O` option.
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Assignments to :const:`__debug__` are illegal and raise a :exc:`SyntaxError`.
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See also the :keyword:`assert` statement.
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.. note::
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The names :data:`None` and :data:`__debug__` cannot be reassigned
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(assignments to them, even as an attribute name, raise :exc:`SyntaxError`),
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so they can be considered "true" constants.
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.. versionchanged:: 2.7
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Assignments to ``__debug__`` as an attribute became illegal.
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Constants added by the :mod:`site` module
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-----------------------------------------
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