mirror of
https://github.com/python/cpython.git
synced 2025-10-31 02:15:10 +00:00
9bd667ad03
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. ........
78 lines
2.4 KiB
ReStructuredText
78 lines
2.4 KiB
ReStructuredText
Built-in Constants
|
|
==================
|
|
|
|
A small number of constants live in the built-in namespace. They are:
|
|
|
|
|
|
.. note::
|
|
|
|
:data:`None`, :data:`False`, :data:`True` and :data:`__debug__` cannot be
|
|
reassigned (assignments to them raise :exc:`SyntaxError`), so they can be
|
|
considered "true" constants.
|
|
|
|
.. XXX False, True, None are keywords too
|
|
|
|
.. data:: False
|
|
|
|
The false value of the :class:`bool` type. Assignments to ``False``
|
|
are illegal and raise a :exc:`SyntaxError`.
|
|
|
|
|
|
.. data:: True
|
|
|
|
The true value of the :class:`bool` type. Assignments to ``True``
|
|
are illegal and raise a :exc:`SyntaxError`.
|
|
|
|
|
|
.. data:: None
|
|
|
|
The sole value of :attr:`types.NoneType`. ``None`` is frequently used to
|
|
represent the absence of a value, as when default arguments are not passed to a
|
|
function. Assignments to ``None`` are illegal and raise a :exc:`SyntaxError`.
|
|
|
|
|
|
.. data:: NotImplemented
|
|
|
|
Special value which can be returned by the "rich comparison" special methods
|
|
(:meth:`__eq__`, :meth:`__lt__`, and friends), to indicate that the comparison
|
|
is not implemented with respect to the other type.
|
|
|
|
|
|
.. data:: Ellipsis
|
|
|
|
The same as ``...``. Special value used mostly in conjunction with extended
|
|
slicing syntax for user-defined container data types, as in ::
|
|
|
|
.. 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.
|
|
|
|
|
|
Constants added by the :mod:`site` module
|
|
-----------------------------------------
|
|
|
|
The :mod:`site` module (which is imported automatically during startup, except
|
|
if the :option:`-S` command-line option is given) adds several constants to the
|
|
built-in namespace. They are useful for the interactive interpreter shell and
|
|
should not be used in programs.
|
|
|
|
.. data:: quit([code=None])
|
|
exit([code=None])
|
|
|
|
Objects that when printed, print a message like "Use quit() or Ctrl-D
|
|
(i.e. EOF) to exit", and when called, raise :exc:`SystemExit` with the
|
|
specified exit code, and when .
|
|
|
|
.. data:: copyright
|
|
license
|
|
credits
|
|
|
|
Objects that when printed, print a message like "Type license() to see the
|
|
full license text", and when called, display the corresponding text in a
|
|
pager-like fashion (one screen at a time).
|
|
|