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svn+ssh://pythondev@svn.python.org/python/trunk ........ r60131 | georg.brandl | 2008-01-20 12:13:29 +0100 (Sun, 20 Jan 2008) | 3 lines #1351692: in pprint, always call format() for dict and list items to enable custom formatting of contents via subclassing PrettyPrinter. ........ r60133 | georg.brandl | 2008-01-20 12:43:03 +0100 (Sun, 20 Jan 2008) | 2 lines #1178141: add addinfourl.code to get http status code from urllib. ........ r60134 | georg.brandl | 2008-01-20 13:05:43 +0100 (Sun, 20 Jan 2008) | 4 lines #856047: respect the ``no_proxy`` env var when checking for proxies in urllib and using the other ``_proxy`` env vars. Original patch by Donovan Baarda. ........ r60135 | georg.brandl | 2008-01-20 13:18:17 +0100 (Sun, 20 Jan 2008) | 4 lines #1664522: in urllib, don't read non-existing directories in ftp mode, returning a 0-byte file -- raise an IOError instead. Original patch from Phil Knirsch. ........ r60136 | georg.brandl | 2008-01-20 13:57:47 +0100 (Sun, 20 Jan 2008) | 2 lines #799369: document possible sys.platform values. ........ r60137 | georg.brandl | 2008-01-20 14:08:37 +0100 (Sun, 20 Jan 2008) | 2 lines #652749: document the constants added to the builtins by site.py. ........ r60138 | georg.brandl | 2008-01-20 14:59:46 +0100 (Sun, 20 Jan 2008) | 2 lines #1648: add sys.gettrace() and sys.getprofile(). ........ r60139 | georg.brandl | 2008-01-20 15:17:42 +0100 (Sun, 20 Jan 2008) | 2 lines #1669: don't allow shutil.rmtree() to be called on a symlink. ........ r60140 | georg.brandl | 2008-01-20 15:20:02 +0100 (Sun, 20 Jan 2008) | 2 lines Fix test_pyclbr after urllib change. ........ r60141 | christian.heimes | 2008-01-20 15:28:28 +0100 (Sun, 20 Jan 2008) | 1 line Fixed a wrong assumption in configure.in and Include/pyport.h. The is finite function is not called isfinite() but finite(). Sorry, my fault. :) ........ r60142 | georg.brandl | 2008-01-20 15:31:27 +0100 (Sun, 20 Jan 2008) | 2 lines #1876: fix typos in test_operator. ........
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2.4 KiB
ReStructuredText
79 lines
2.4 KiB
ReStructuredText
Built-in Constants
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==================
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A small number of constants live in the built-in namespace. They are:
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.. note::
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:data:`None`, :data:`False`, :data:`True` and :data:`__debug__` cannot be
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reassigned (assignments to them raise :exc:`SyntaxError`), so they can be
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considered "true" constants.
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.. XXX False, True, None are keywords too
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.. data:: False
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The false value of the :class:`bool` type. Assignments to ``False``
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are illegal and raise a :exc:`SyntaxError`.
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.. data:: True
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The true value of the :class:`bool` type. Assignments to ``True``
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are illegal and raise a :exc:`SyntaxError`.
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.. data:: None
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The sole value of :attr:`types.NoneType`. ``None`` is frequently used to
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represent the absence of a value, as when default arguments are not passed to a
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function. Assignments to ``None`` are illegal and raise a :exc:`SyntaxError`.
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.. data:: NotImplemented
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Special value which can be returned by the "rich comparison" special methods
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(:meth:`__eq__`, :meth:`__lt__`, and friends), to indicate that the comparison
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is not implemented with respect to the other type.
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.. data:: Ellipsis
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The same as ``...``. Special value used mostly in conjunction with extended
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slicing syntax for user-defined container data types, as in ::
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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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Constants added by the :mod:`site` module
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-----------------------------------------
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The :mod:`site` module (which is imported automatically during startup, except
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if the :option:`-S` command-line option is given) adds several constants to the
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built-in namespace. They are useful for the interactive interpreter shell and
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should not be used in programs.
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.. data:: quit([code=None])
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exit([code=None])
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Objects that when printed, print a message like "Use quit() or Ctrl-D
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(i.e. EOF) to exit", and when called, raise :exc:`SystemExit` with the
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specified exit code, and when .
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.. data:: copyright
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license
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credits
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Objects that when printed, print a message like "Type license() to see the
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full license text", and when called, display the corresponding text in a
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pager-like fashion (one screen at a time).
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