[Cython] Cython 0.23 released
Antoine Martin
antoine at nagafix.co.uk
Sun Aug 9 08:54:49 CEST 2015
Hi,
I've just hit a regression with 0.23: a recursion loop generating code
for this particular pyx:
http://xpra.org/trac/browser/xpra/trunk/src/xpra/codecs/nvenc4/encoder.pyx
I don't think we have such loops in our setup.py data structures or in
that pyx, but that's possible. (I will try to check later)
The same code builds fine on all platforms with Cython 0.22.1.
Full stack trace attached to this email. Loop excerpt:
File "Cython/Compiler/FlowControl.py", line 336, in
Cython.Compiler.FlowControl.NameAssignment.__deepcopy__
(/usr/src/rpmbuild/BUILD/Cython-0.23/Cython/Compiler/FlowControl.c:10989)
File "/usr/lib64/python2.7/copy.py", line 190, in deepcopy
y = _reconstruct(x, rv, 1, memo)
File "/usr/lib64/python2.7/copy.py", line 328, in _reconstruct
args = deepcopy(args, memo)
File "/usr/lib64/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/usr/lib64/python2.7/copy.py", line 237, in _deepcopy_tuple
y.append(deepcopy(a, memo))
File "/usr/lib64/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/usr/lib64/python2.7/copy.py", line 230, in _deepcopy_list
y.append(deepcopy(a, memo))
File "/usr/lib64/python2.7/copy.py", line 174, in deepcopy
y = copier(memo)
File "Cython/Compiler/FlowControl.py", line 418, in
Cython.Compiler.FlowControl.NameReference.__deepcopy__
(/usr/src/rpmbuild/BUILD/Cython-0.23/Cython/Compiler/FlowControl.c:13685)
File "/usr/lib64/python2.7/copy.py", line 190, in deepcopy
y = _reconstruct(x, rv, 1, memo)
File "/usr/lib64/python2.7/copy.py", line 334, in _reconstruct
state = deepcopy(state, memo)
File "/usr/lib64/python2.7/copy.py", line 163, in deepcopy
y = copier(x, memo)
File "/usr/lib64/python2.7/copy.py", line 257, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib64/python2.7/copy.py", line 190, in deepcopy
y = _reconstruct(x, rv, 1, memo)
File "/usr/lib64/python2.7/copy.py", line 351, in _reconstruct
item = deepcopy(item, memo)
File "/usr/lib64/python2.7/copy.py", line 174, in deepcopy
y = copier(memo)
File "Cython/Compiler/FlowControl.py", line 336, in
Cython.Compiler.FlowControl.NameAssignment.__deepcopy__
(/usr/src/rpmbuild/BUILD/Cython-0.23/Cython/Compiler/FlowControl.c:10989)
....
Sorry for not testing the 0.23 beta, which might have caught this sooner.
Cheers
Antoine
On 09/08/15 01:47, Stefan Behnel wrote:
> Hi everyone,
>
> given the positive feedback on the previous beta releases, I'm happy to
> announce the final release of Cython 0.23. There were only minor changes
> and fixes since the second beta.
>
> https://pypi.python.org/pypi/Cython/0.23
>
> This is a major feature release. Highlights include, in addition to several
> important bug fixes:
>
> * PEP 492 (async/await) and PEP 448 (star-unpacking generalizations)
> * inlined generator expressions
> * support for the C++ assignment and bool() operators
> * support for coverage analysis
>
> Complete changelog follows below. Upgrading is generally recommended.
>
>
> You can get the signed release from here:
>
> http://cython.org/
>
> http://cython.org/release/Cython-0.23.tar.gz
>
> http://cython.org/release/Cython-0.23.zip
>
>
> SHA1 sums:
> 5a49123b39d89a20fb88bdc7886210c39cdff695 Cython-0.23.tar.gz
> 9bec6c6df861be49ed608a0ab688b67bba543abe Cython-0.23.zip
>
> Have fun,
>
> Stefan
>
>
>
> 0.23 (2015-08-08)
> =================
>
> Features added
> --------------
>
> * PEP 492 (async/await) was implemented.
> See https://www.python.org/dev/peps/pep-0492/
>
> * PEP 448 (Additional Unpacking Generalizations) was implemented.
> See https://www.python.org/dev/peps/pep-0448/
>
> * Support for coverage.py 4.0+ can be enabled by adding the plugin
> "Cython.Coverage" to the ".coveragerc" config file.
>
> * Annotated HTML source pages can integrate (XML) coverage reports.
>
> * Tracing is supported in ``nogil`` functions/sections and module init
> code.
>
> * When generators are used in a Cython module and the module imports the
> modules "inspect" and/or "asyncio", Cython enables interoperability by
> patching these modules during the import to recognise Cython's internal
> generator and coroutine types. This can be disabled by C compiling the
> module with "-D CYTHON_PATCH_ASYNCIO=0" or "-D CYTHON_PATCH_INSPECT=0"
>
> * When generators or coroutines are used in a Cython module, their types
> are registered with the ``Generator`` and ``Coroutine`` ABCs in the
> ``collections`` or ``collections.abc`` stdlib module at import time to
> enable interoperability with code that needs to detect and process Python
> generators/coroutines. These ABCs were added in CPython 3.5 and are
> available for older Python versions through the ``backports_abc`` module
> on PyPI. See https://bugs.python.org/issue24018
>
> * Adding/subtracting/dividing/modulus and equality comparisons with
> constant Python floats and small integers are faster.
>
> * Binary and/or/xor/rshift operations with small constant Python integers
> are faster.
>
> * When called on generator expressions, the builtins ``all()``, ``any()``,
> ``dict()``, ``list()``, ``set()``, ``sorted()`` and ``unicode.join()``
> avoid the generator iteration overhead by inlining a part of their
> functionality into the for-loop.
>
> * Keyword argument dicts are no longer copied on function entry when they
> are not being used or only passed through to other function calls (e.g.
> in wrapper functions).
>
> * The ``PyTypeObject`` declaration in ``cpython.object`` was extended.
>
> * The builtin ``type`` type is now declared as PyTypeObject in source,
> allowing for extern functions taking type parameters to have the correct
> C signatures. Note that this might break code that uses ``type`` just
> for passing around Python types in typed variables. Removing the type
> declaration provides a backwards compatible fix.
>
> * ``wraparound()`` and ``boundscheck()`` are available as no-ops in pure
> Python mode.
>
> * Const iterators were added to the provided C++ STL declarations.
>
> * Smart pointers were added to the provided C++ STL declarations.
> Patch by Daniel Filonik.
>
> * ``NULL`` is allowed as default argument when embedding signatures.
> This fixes ticket 843.
>
> * When compiling with ``--embed``, the internal module name is changed to
> ``__main__`` to allow arbitrary program names, including those that would
> be invalid for modules. Note that this prevents reuse of the generated
> C code as an importable module.
>
> * External C++ classes that overload the assignment operator can be used.
> Patch by Ian Henriksen.
>
> * Support operator bool() for C++ classes so they can be used in
> if-statements.
>
> Bugs fixed
> ----------
>
> * Calling "yield from" from Python on a Cython generator that returned a
> value triggered a crash in CPython. This is now being worked around.
> See https://bugs.python.org/issue23996
>
> * Language level 3 did not enable true division (a.k.a. float division)
> for integer operands.
>
> * Functions with fused argument types that included a generic 'object'
> fallback could end up using that fallback also for other explicitly
> listed object types.
>
> * Relative cimports could accidentally fall back to trying an absolute
> cimport on failure.
>
> * The result of calling a C struct constructor no longer requires an
> intermediate assignment when coercing to a Python dict.
>
> * C++ exception declarations with mapping functions could fail to compile
> when pre-declared in .pxd files.
>
> * ``cpdef void`` methods are now permitted.
>
> * ``abs(cint)`` could fail to compile in MSVC and used sub-optimal code
> in C++. Patch by David Vierra, original patch by Michael Enßlin.
>
> * Buffer index calculations using index variables with small C integer
> types could overflow for large buffer sizes.
> Original patch by David Vierra.
>
> * C unions use a saner way to coerce from and to Python dicts.
>
> * When compiling a module ``foo.pyx``, the directories in ``sys.path``
> are no longer searched when looking for ``foo.pxd``.
> Patch by Jeroen Demeyer.
>
> * Memory leaks in the embedding main function were fixed.
> Original patch by Michael Enßlin.
>
> * Some complex Python expressions could fail to compile inside of finally
> clauses.
>
> * Unprefixed 'str' literals were not supported as C varargs arguments.
>
> * Fixed type errors in conversion enum types to/from Python. Note that
> this imposes stricter correctness requirements on enum declarations.
>
> Other changes
> -------------
>
> * Changed mangling scheme in header files generated by ``cdef api``
> declarations.
>
> * Installation under CPython 3.3+ no longer requires a pass of the
> 2to3 tool. This also makes it possible to run Cython in Python
> 3.3+ from a source checkout without installing it first.
> Patch by Petr Viktorin.
>
> * ``jedi-typer.py`` (in ``Tools/``) was extended and renamed to
> ``jedityper.py`` (to make it importable) and now works with and
> requires Jedi 0.9. Patch by Tzer-jen Wei.
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