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Code Issues Releases Wiki Activity

bpo-32996: Enhancements to What's New based on feedback (GH-7988)

This commit is contained in:
Elvis Pranskevichus 2018-06-28 11:57:37 -04:00 committed by Yury Selivanov
parent e76ac9d4ef
commit 4d26c8a177
1 changed files with 29 additions and 21 deletions
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Doc/whatsnew/3.7.rst
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@ -320,7 +320,8 @@ PEP 562: Customization of Access to Module Attributes
-----------------------------------------------------
Python 3.7 allows defining :meth:`__getattr__` on modules and will call
it whenever a module attribute is otherwise not found.
it whenever a module attribute is otherwise not found. Defining
:meth:`__dir__` on modules is now also allowed.
A typical example of where this may be useful is module attribute deprecation
and lazy loading.
@ -336,8 +337,11 @@ and lazy loading.
PEP 564: New Time Functions With Nanosecond Resolution
------------------------------------------------------
:pep:`564` adds six new "nanosecond" variants of existing functions
to the :mod:`time` module:
The resolution of clocks in modern systems can exceed the limited precision
of a floating point number returned by the :func:`time.time` function
and its variants. To avoid loss of precision, :pep:`564` adds six new
"nanosecond" variants of the existing timer functions to the :mod:`time`
module:
* :func:`time.clock_gettime_ns`
* :func:`time.clock_settime_ns`
@ -346,12 +350,11 @@ to the :mod:`time` module:
* :func:`time.process_time_ns`
* :func:`time.time_ns`
The new functions are similar in function to the existing functions
without the ``_ns`` suffix. They differ by returning nanoseconds as
integers instead of fractional seconds.
The new functions return the number of nanoseconds as an integer value.
On Linux and Windows the resolution of :func:`time.time_ns` is 3 times
better than that of :func:`time.time`.
`Measurements <https://www.python.org/dev/peps/pep-0564/#annex-clocks-resolution-in-python>`_
show that on Linux and Windows the resolution of :func:`time.time_ns` is
approximately 3 times better than that of :func:`time.time`.
.. seealso::
@ -418,19 +421,6 @@ fixed.
PEP written and implemented by Ivan Levkivskyi
.. _whatsnew37-devmode:
Development Runtime Mode: -X dev
--------------------------------
The new :option:`-X` ``dev`` command line option or the new
:envvar:`PYTHONDEVMODE` environment variable can be used to enable
CPython's *development mode*. When in development mode, CPython performs
additional runtime checks which are too expensive to be enabled by default.
See :option:`-X` ``dev`` documentation for the full description of the effects
of this mode.
.. _whatsnew37-pep552:
PEP 552: Hash-based .pyc Files
@ -460,6 +450,11 @@ keeping ``.pyc`` files up-to-date.
See :ref:`pyc-invalidation` for more information.
.. seealso::
:pep:`552` -- Deterministic pycs
PEP written and implemented by Benjamin Peterson
.. _whatsnew37-pep545:
@ -482,6 +477,19 @@ Three new translations have been added:
Victor Stinner.
.. _whatsnew37-devmode:
Development Runtime Mode: -X dev
--------------------------------
The new :option:`-X` ``dev`` command line option or the new
:envvar:`PYTHONDEVMODE` environment variable can be used to enable
CPython's *development mode*. When in development mode, CPython performs
additional runtime checks that are too expensive to be enabled by default.
See :option:`-X` ``dev`` documentation for the full description of the effects
of this mode.
Other Language Changes
======================