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Issue #22524: Rephrase scandir addition in What's New in Python 3.5

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Patch written by Ben Hoyt.
This commit is contained in:
Victor Stinner 2015-03-10 13:29:41 +01:00
parent 524a5ba111
commit 37f2034802
1 changed files with 18 additions and 8 deletions
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26
Doc/whatsnew/3.5.rst
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@ -115,13 +115,17 @@ Please read on for a comprehensive list of user-facing changes.
PEP 471 - os.scandir() function -- a better and faster directory iterator PEP 471 - os.scandir() function -- a better and faster directory iterator
------------------------------------------------------------------------- -------------------------------------------------------------------------
:pep:`471` includes a new directory iteration function, :func:`os.scandir`, :pep:`471` adds a new directory iteration function, :func:`os.scandir`,
in the standard library. to the standard library. Additionally, :func:`os.walk` is now
implemented using :func:`os.scandir`, which speeds it up by 3-5 times
on POSIX systems and by 7-20 times on Windows systems.
PEP and implementation written by Ben Hoyt with the help of Victor Stinner.
.. seealso:: .. seealso::
:pep:`471` -- os.scandir() function -- a better and faster directory :pep:`471` -- os.scandir() function -- a better and faster directory
iterator. iterator
PEP 475: Retry system calls failing with EINTR PEP 475: Retry system calls failing with EINTR
@ -131,8 +135,6 @@ PEP 475: Retry system calls failing with EINTR
this means that user code doesn't have to deal with EINTR or InterruptedError this means that user code doesn't have to deal with EINTR or InterruptedError
manually, and should make it more robust against asynchronous signal reception. manually, and should make it more robust against asynchronous signal reception.
PEP and implementation written by Ben Hoyt with the help of Victor Stinner.
.. seealso:: .. seealso::
:pep:`475` -- Retry system calls failing with EINTR :pep:`475` -- Retry system calls failing with EINTR
@ -294,9 +296,11 @@ json
os os
-- --
* New :func:`os.scandir` function: Return an iterator of :class:`os.DirEntry` * New :func:`os.scandir` function that exposes file information from
objects corresponding to the entries in the directory given by *path*. the operating system when listing a directory. :func:`os.scandir`
(Implementation written by Ben Hoyt with the help of Victor Stinner.) returns an iterator of :class:`os.DirEntry` objects corresponding to
the entries in the directory given by *path*. (Contributed by Ben
Hoyt with the help of Victor Stinner in :issue:`22524`.)
* :class:`os.stat_result` now has a :attr:`~os.stat_result.st_file_attributes` * :class:`os.stat_result` now has a :attr:`~os.stat_result.st_file_attributes`
attribute on Windows. (Contributed by Ben Hoyt in :issue:`21719`.) attribute on Windows. (Contributed by Ben Hoyt in :issue:`21719`.)
@ -419,6 +423,12 @@ Optimizations
The following performance enhancements have been added: The following performance enhancements have been added:
* :func:`os.walk` has been sped up by 3-5x on POSIX systems and 7-20x
on Windows. This was done using the new :func:`os.scandir` function,
which exposes file information from the underlying ``readdir`` and
``FindFirstFile``/``FindNextFile`` system calls. (Contributed by
Ben Hoyt with help from Victor Stinner in :issue:`23605`.)
* Construction of ``bytes(int)`` (filled by zero bytes) is faster and use less * Construction of ``bytes(int)`` (filled by zero bytes) is faster and use less
memory for large objects. ``calloc()`` is used instead of ``malloc()`` to memory for large objects. ``calloc()`` is used instead of ``malloc()`` to
allocate memory for these objects. allocate memory for these objects.