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Summary – Release highlights
New syntax features:
PEP 498, formatted string literals.
PEP 515, underscores in numeric literals.
PEP 526, syntax for variable annotations.
PEP 525, asynchronous generators.
PEP 530: asynchronous comprehensions.
New library modules:
secrets: PEP 506 – Adding A Secrets Module To The Standard Library.
CPython implementation improvements:
The dict type has been reimplemented to use a more compact representation based on a proposal by Raymond Hettinger and similar to the PyPy dict implementation. This resulted in dictionaries using 20% to 25% less memory when compared to Python 3.5.
Customization of class creation has been simplified with the new protocol.
The class attribute definition order is now preserved.
The order of elements in **kwargs now corresponds to the order in which keyword arguments were passed to the function.
DTrace and SystemTap probing support has been added.
The new PYTHONMALLOC environment variable can now be used to debug the interpreter memory allocation and access errors.
Significant improvements in the standard library:
The asyncio module has received new features, significant usability and performance improvements, and a fair amount of bug fixes. Starting with Python 3.6 the asyncio module is no longer provisional and its API is considered stable.
A new file system path protocol has been implemented to support path-like objects. All standard library functions operating on paths have been updated to work with the new protocol.
The datetime module has gained support for Local Time Disambiguation.
The typing module received a number of improvements and is no longer provisional.
The tracemalloc module has been significantly reworked and is now used to provide better output for ResourceWarning as well as provide better diagnostics for memory allocation errors. See the PYTHONMALLOC section for more information.
Security improvements:
The new secrets module has been added to simplify the generation of cryptographically strong pseudo-random numbers suitable for managing secrets such as account authentication, tokens, and similar.
On Linux, os.urandom() now blocks until the system urandom entropy pool is initialized to increase the security. See the PEP 524 for the rationale.
The hashlib and ssl modules now support OpenSSL 1.1.0.
The default settings and feature set of the ssl module have been improved.
The hashlib module received support for the BLAKE2, SHA-3 and SHAKE hash algorithms and the scrypt() key derivation function.
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New syntax features:
* PEP 492, coroutines with async and await syntax.
* PEP 465, a new matrix multiplication operator: a @ b.
* PEP 448, additional unpacking generalizations.
New library modules:
* typing: PEP 484 – Type Hints.
* zipapp: PEP 441 Improving Python ZIP Application Support.
New built-in features:
* bytes % args, bytearray % args: PEP 461 – Adding % formatting to bytes and bytearray.
* New bytes.hex(), bytearray.hex() and memoryview.hex() methods. (Contributed by Arnon Yaari in issue 9951.)
* memoryview now supports tuple indexing (including multi-dimensional). (Contributed by Antoine Pitrou in issue 23632.)
* Generators have a new gi_yieldfrom attribute, which returns the object being iterated by yield from expressions. (Contributed by Benno Leslie and Yury Selivanov in issue 24450.)
* A new RecursionError exception is now raised when maximum recursion depth is reached. (Contributed by Georg Brandl in issue 19235.)
CPython implementation improvements:
* When the LC_TYPE locale is the POSIX locale (C locale), sys.stdin and sys.stdout now use the surrogateescape error handler, instead of the strict error handler. (Contributed by Victor Stinner in issue 19977.)
* .pyo files are no longer used and have been replaced by a more flexible scheme that includes the optimization level explicitly in .pyc name. (See PEP 488 overview.)
* Builtin and extension modules are now initialized in a multi-phase process, which is similar to how Python modules are loaded. (See PEP 489 overview.)
Significant improvements in the standard library:
* collections.OrderedDict is now implemented in C, which makes it 4 to 100 times faster.
* The ssl module gained support for Memory BIO, which decouples SSL protocol handling from network IO.
* The new os.scandir() function provides a better and significantly faster way of directory traversal.
* functools.lru_cache() has been mostly reimplemented in C, yielding much better performance.
* The new subprocess.run() function provides a streamlined way to run subprocesses.
* The traceback module has been significantly enhanced for improved performance and developer convenience.
Security improvements:
* SSLv3 is now disabled throughout the standard library. It can still be enabled by instantiating a ssl.SSLContext manually. (See issue 22638 for more details; this change was backported to CPython 3.4 and 2.7.)
* HTTP cookie parsing is now stricter, in order to protect against potential injection attacks. (Contributed by Antoine Pitrou in issue 22796.)
Windows improvements:
* A new installer for Windows has replaced the old MSI. See Using Python on Windows for more information.
* Windows builds now use Microsoft Visual C++ 14.0, and extension modules should use the same.
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tech-pkg@ and pkgsrc-users@.
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it finding the native python versions
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Allow python-3.x by default.
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Upstream doesn't talk about it any longer, and python-3.3 is a drop-in
replacement.
Ok bsiegert, prlw1, rodent
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Avoids problems with make on NetBSD 5 where empty(XYZ:Mfoo) fails
rather than yielding false if XYZ is undefined.
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This broke packages that needed a target Python at build-time.
Instead, change it from defined/undefined to yes/no/tool. Most cases
of defined used `yes' anyway; fix the few stragglers do that instead.
New case `tool' is for TOOL_DEPENDS rather than buildlink3.
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ok agc
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There are three python3 versions in pkgsrc, python31, python32 and
python33.
The last published update for python was only released for python27,
python32 and python33 -- not for python31.
No reason for keeping python31 was brought up in two weeks
on pkgsrc-users, so remove it.
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as suggested by obache@
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for registering conflicts between python modules.
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to "user variables" section. pkglint is now aware of them. Bump pkglint
version. Oked by wiz@
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provide py2x and py3x PLIST_VARS to let pkgs deal easily with files
installed for one major version but not for the other
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to "yes", so remove variable and code for "no".
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Remove devel/py-ctypes (only needed by and supporting python24).
Remove PYTHON_VERSIONS_ACCEPTED and PYTHON_VERSIONS_INCOMPATIBLE
lines that just mirror defaults now.
Miscellaneous cleanup while editing all these files.
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last week.
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---
Module Name: pkgsrc
Committed By: sbd
Date: Tue Feb 21 21:04:30 UTC 2012
Modified Files:
pkgsrc/lang/python: pyversion.mk
Log Message:
Add _PYTHON_VERSION_DEFAULT with the "default" python version and set
PYTHON_VERSION_DEFAULT from that.
To generate a diff of this commit:
cvs rdiff -u -r1.93 -r1.94 pkgsrc/lang/python/pyversion.mk
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PYTHON_VERSION_DEFAULT from that.
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be found, so provide it.
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Remove it from the default list for the rest.
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What uses PYDEPENDENCY?
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(I have been using this for around 18 months on several platforms;
adjusted once after python27 was added.)
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variable settings affecting binary packages.
From Aleksey Cheusov in PR 44695.
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works with python-2.7.
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like ${EGG_INFODIR}.
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Suppport conditional PLIST inclusion of the expected egg file, because
python2.4 distutils does not create them but later versions do. (Note
that PRINT_PLIST_AWK production is not working, probably due to order
of substitution.)
Earlier patch reviewed by wiz@.
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selected by pkgsrc
this automatically affects pkgs which use FIND_PACKAGE(PythonInterp)
or FIND_PACKAGE(PythonLibs)
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Not even Apple were able to build a 64-Bit version of Python 2.5.
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