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Revise 3141 section a bit; add some Windows items

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Andrew M. Kuchling 2008-01-17 12:00:15 +00:00
parent bde4ae4bde
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Doc/whatsnew/2.6.rst
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@ -549,7 +549,7 @@ PEP 3141: A Type Hierarchy for Numbers
=====================================================
In Python 3.0, several abstract base classes for numeric types,
inspired by Scheme's numeric tower (XXX add link), are being added.
inspired by Scheme's numeric tower, are being added.
This change was backported to 2.6 as the :mod:`numbers` module.
The most general ABC is :class:`Number`. It defines no operations at
@ -585,26 +585,16 @@ can be shifted left and right with ``<<`` and ``>>``,
combined using bitwise operations such as ``&`` and ``|``,
and can be used as array indexes and slice boundaries.
The PEP slightly redefines the existing built-ins :func:`math.floor`,
:func:`math.ceil`, :func:`round`, and adds a new one, :func:`trunc`. All of them
take a :class:`Real` value and return an :class:`Integral`.
In Python 3.0, the PEP slightly redefines the existing built-ins
:func:`math.floor`, :func:`math.ceil`, :func:`round`, and adds a new
one, :func:`trunc`, that's been backported to Python 2.6.
:func:`trunc` rounds toward zero, returning the closest
:class:`Integral` that's between the function's argument and zero.
* :func:`math.floor` returns the closest :class:`Integral` that's
smaller than the function's argument. Numeric types can define a
:meth:`__floor__` method to provide a custom implementation.
.. seealso::
* :func:`math.ceil` returns the closest :class:`Integral` that's
greater than the function's argument. It can be provided by a
:meth:`__ceil__` method.
XXX link: Discusses Scheme's numeric tower.
* :func:`trunc` rounds toward zero, returning the closest
:class:`Integral` that's between the function's argument and zero.
It can be provided by a :meth:`__trunc` method.
* :func:`round` takes a :class:`Real` and rounds it off, optionally to a
specified number of decimal places. It will call a :meth:`__round__`
method. Whether .5 should be rounded up, or down, or toward the
nearest even number, is left up to the type's implementation.
The Rational Module
@ -1347,6 +1337,14 @@ Port-Specific Changes: Windows
value, as does the :func:`getwche` function. The :func:`putwch` function
takes a Unicode character and writes it to the console.
* :func:`os.path.expandvars` will now expand environment variables
in the form "%var%", and "~user" will be expanded into the
user's home directory path. (Contributed by Josiah Carlson.)
* The :mod:`socket` module's socket objects now have an
:meth:`ioctl` method that provides a limited interface to the
:cfunc:`WSAIoctl` system interface.
* The :mod:`_winreg` module now has a function,
:func:`ExpandEnvironmentStrings`,
that expands environment variable references such as ``%NAME%``