Cython 0.23 發布，此版本相比第二個測試版本改進很小，還有一些 bug 修復。

此版本是個重要的特性版本，值得關注的改進如下：

* PEP 492 (async/await) 和 PEP 448 (star-unpacking generalizations)

* 內聯生長器表達式

* 支持 C++ 分配和 bool() 操作符

* 支持覆蓋分析

強烈建議更新，下載：

SHA1 sums:

5a49123b39d89a20fb88bdc7886210

c39cdff695 ?Cython-0.23.tar.gz

9bec6c6df861be49ed608a0ab688b67bba543abe ?Cython-0.23.zip

0.23 (2015-08-08)

=================

新特性

————–

* 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 修復

———-

* 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 En?lin.

* 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 En?lin.

* 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.

其他改進

————-

* 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.

更多內容請看發行說明。

準確說Cython是單獨的一門語言，專門用來寫在Python里面import用的擴展庫。實際上Cython的語法基本上跟Python一致，而 Cython有專門的“編譯器”先將 Cython代碼轉變成C（自動加入了一大堆的C-Python API），然后使用C編譯器編譯出最終的Python可調用的模塊。

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