./devel/py-cython, C-Extensions for Python

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Branch: CURRENT, Version: 0.28.3, Package name: py27-cython-0.28.3, Maintainer: pkgsrc-users

The Cython language makes writing C extensions for the Python language
as easy as Python itself. Cython is a source code translator based on
the well-known Pyrex, but supports more cutting edge functionality and

The Cython language is very close to the Python language (and most
Python code is also valid Cython code), but Cython additionally supports
calling C functions and declaring C types on variables and class
attributes. This allows the compiler to generate very efficient C code
from Cython code.

This makes Cython the ideal language for writing glue code for external
C libraries, and for fast C modules that speed up the execution of
Python code.

Required to run:
[devel/py-setuptools] [lang/python27]

Required to build:

Master sites:

SHA1: 1a7e5a45a5e7589660934b911d43f4a2d0a50f5f
RMD160: 5b3de1c00bd88c9745404d1d5807ea37853eca03
Filesize: 1836.254 KB

Version history: (Expand)

CVS history: (Expand)

   2018-05-29 13:45:06 by Adam Ciarcinski | Files touched by this commit (2) | Package updated
Log message:
py-cython: updated to 0.28.3

Bugs fixed
* Set iteration was broken in non-CPython since 0.28.
* UnicodeEncodeError in Py2 when %s formatting is optimised for unicode strings.
* Work around a crash bug in g++ 4.4.x by disabling the size reduction setting \ 
of the module init function in this version.
   2018-04-13 08:55:45 by Adam Ciarcinski | Files touched by this commit (2) | Package updated
Log message:
py-cython: updated to 0.28.2

0.28.2 (2018-04-13)
Features added
abs() is faster for Python long objects.
The C++11 methods front() and end() were added to the declaration of libcpp.string.
The C++11 methods reserve() and bucket_count() are declared for libcpp.unordered_map.

Bugs fixed
The copy of a read-only memoryview was considered read-only as well, whereas a \ 
common reason to copy a read-only view is to make it writable. The result of the \ 
copying is now a writable buffer by default.
The switch statement generation failed to apply recursively to the body of \ 
converted if-statements.
NULL was sometimes rejected as exception return value when the returned type is \ 
a fused pointer type.
Fixed compatibility with PyPy 5.11.

Other changes
The NumPy tutorial was rewritten to use memoryviews instead of the older buffer \ 
declaration syntax.
   2018-03-19 09:22:54 by Adam Ciarcinski | Files touched by this commit (2) | Package updated
Log message:
py-cython: updated to 0.28.1

Bugs fixed
PyFrozenSet_New() was accidentally used in PyPy where it is missing from the C-API.
Assignment between some C++ templated types were incorrectly rejected when the \ 
templates mix const with ctypedef.
Undeclared C++ no-args constructors in subclasses could make the compilation \ 
fail if the base class constructor was declared without nogil.
Bytes %-formatting inferred basestring (bytes or unicode) as result type in some \ 
cases where bytes would have been safe to infer.
None was accidentally disallowed as typed return value of dict.pop().
   2018-03-15 10:30:18 by Adam Ciarcinski | Files touched by this commit (3) | Package updated
Log message:
py-cython: updated to 0.28

Cdef classes can now multiply inherit from ordinary Python classes.
Type inference is now supported for Pythran compiled NumPy expressions.
The const modifier can be applied to memoryview declarations to allow read-only \ 
buffers as input.
C code in the docstring of a cdef extern block is copied verbatimly into the \ 
generated file. Patch by Jeroen Demeyer.
When compiling with gcc, the module init function is now tuned for small code \ 
size instead of whatever compile flags were provided externally. Cython now also \ 
disables some code intensive optimisations in that function to further reduce \ 
the code size.
Decorating an async coroutine with @cython.iterable_coroutine changes its type \ 
at compile time to make it iterable. While this is not strictly in line with \ 
PEP-492, it improves the interoperability with old-style coroutines that use \ 
yield from instead of await.
The IPython magic has preliminary support for JupyterLab.
The new TSS C-API in CPython 3.7 is supported and has been backported. Patch by \ 
Naotoshi Seo.
Cython knows the new Py_tss_t type defined in PEP-539 and automatically \ 
initialises variables declared with that type to Py_tss_NEEDS_INIT, a value \ 
which cannot be used outside of static assignments.
The set methods .remove() and .discard() are optimised. Patch by Antoine Pitrou.
dict.pop() is optimised. Original patch by Antoine Pitrou.
Iteration over sets and frozensets is optimised.
Safe integer loops (< range(2^30)) are automatically optimised into C loops.
alist.extend([a,b,c]) is optimised into sequential list.append() calls for short \ 
literal sequences.
Calls to builtin methods that are not specifically optimised into C-API calls \ 
now use a cache that avoids repeated lookups of the underlying C function.
Single argument function calls can avoid the argument tuple creation in some cases.
Some redundant extension type checks are avoided.
Formatting C enum values in f-strings is faster, as well as some other special cases.
String formatting with the ‘%’ operator is optimised into f-strings in \ 
simple cases.
Subscripting (item access) is faster in some cases.
Some bytearray operations have been optimised similar to bytes.
Some PEP-484/526 container type declarations are now considered for loop \ 
Indexing into memoryview slices with view[i][j] is now optimised into view[i, j].
Python compatible cython.* types can now be mixed with type declarations in \ 
Cython syntax.
Name lookups in the module and in classes are faster.
Python attribute lookups on extension types without instance dict are faster.
Some missing signals were added to libc/signal.pxd. Patch by Jeroen Demeyer.
The warning about repeated extern declarations is now visible by default.
The exception handling of the function types used by CPython’s type slot \ 
functions was corrected to match the de-facto standard behaviour, so that code \ 
that uses them directly benefits from automatic and correct exception \ 
propagation. Patch by Jeroen Demeyer.
Defining the macro CYTHON_NO_PYINIT_EXPORT will prevent the module init function \ 
from being exported as symbol, e.g. when linking modules statically in an \ 
embedding setup. Patch by AraHaan.
   2017-11-06 11:12:29 by Adam Ciarcinski | Files touched by this commit (2) | Package updated
Log message:
py-cython: updated to 0.27.3


Bugs fixed

* String forward references to extension types like \ 
  failed to find the named type.

* NumPy slicing generated incorrect results when compiled with Pythran.

* Fix "undefined reference" linker error for generators on Windows in \ 

* Adapt to recent C-API change of ``PyThreadState`` in CPython 3.7.

* Fix signature of ``PyWeakref_GetObject()`` API declaration.
   2017-10-23 22:46:22 by Adam Ciarcinski | Files touched by this commit (2) | Package updated
Log message:
py-cython: updated to 0.27.2


Bugs fixed
* Comprehensions could incorrectly be optimised away when they appeared in boolean
  test contexts.
* The special methods ``__eq__``, ``__lt__`` etc. in extension types did not type
  their first argument as the type of the class but ``object``.
* Crash on first lookup of "cline_in_traceback" option during \ 
exception handling.
* Some nested module level comprehensions failed to compile.
* Compiler crash on some complex type declarations in pure mode.
* ``std::unordered_map.erase()`` was declared with an incorrect ``void`` return
  type in ``libcpp.unordered_map``.
* Invalid use of C++ ``fallthrough`` attribute before C++11 and similar issue in \ 
* Compiler crash on misnamed properties.
   2017-10-03 21:50:23 by Adam Ciarcinski | Files touched by this commit (2) | Package updated
Log message:
py-cython: update to 0.27.1

Features added
* The Jupyter magic has a new debug option --verbose that shows details about \ 
the distutils invocation.

Bugs fixed
* Py3 list comprehensions in class bodies resulted in invalid C code.
* Modules built for later CPython 3.5.x versions failed to import in 3.5.0/3.5.1.
* Deallocating fused types functions and methods kept their GC tracking enabled, \ 
which could potentially lead to recursive deallocation attempts.
* Crash when compiling in C++ mode with old setuptools versions.
* C++ object arguments for the constructor of Cython implemented C++ are now \ 
passed by reference and not by value to allow for non-copyable arguments, such \ 
as unique_ptr.
* API-exported C++ classes with Python object members failed to compile.
* Some issues with the new relaxed exception value handling were resolved.
* Python classes as annotation types could prevent compilation.
* Cython annotation types in Python files could lead to import failures with a \ 
"cython undefined" error. Recognised types are now turned into \ 
* Coverage analysis could fail to report on extension modules on some platforms.
* Annotations could be parsed (and rejected) as types even with \ 

Other changes
* PEP 489 support has been disabled by default to counter incompatibilities with \ 
import setups that try to reload or reinitialise modules.
   2017-09-30 11:53:23 by Adam Ciarcinski | Files touched by this commit (3) | Package updated
Log message:
py-cython: update to 0.27


Features added
* Extension module initialisation follows
  `PEP 489 <https://www.python.org/dev/peps/pep-0489/>`_ in CPython 3.5+, which
  resolves several differences with regard to normal Python modules.  This makes
  the global names ``__file__`` and ``__path__`` correctly available to module
  level code and improves the support for module-level relative imports.
* Asynchronous generators (`PEP 525 \ 
  and asynchronous comprehensions (`PEP 530 \ 
  have been implemented.  Note that async generators require finalisation support
  in order to allow for asynchronous operations during cleanup, which is only
  available in CPython 3.6+.  All other functionality has been backported as usual.
* Variable annotations are now parsed according to
  `PEP 526 <https://www.python.org/dev/peps/pep-0526/>`_.  Cython types (e.g.
  ``cython.int``) are evaluated as C type declarations and everything else as Python
  types.  This can be disabled with the directive ``annotation_typing=False``.
  Note that most complex PEP-484 style annotations are currently ignored.  This will
  change in future releases.
* Extension types (also in pure Python mode) can implement the normal special methods
  ``__eq__``, ``__lt__`` etc. for comparisons instead of the low-level \ 
* New decorator ``@cython.exceptval(x=None, check=False)`` that makes the signature
  declarations ``except x``, ``except? x`` and ``except *`` available to pure Python
  code.  Original patch by Antonio Cuni.
* Signature annotations are now included in the signature docstring generated by
  the ``embedsignature`` directive.
* The gdb support for Python code (``libpython.py``) was updated to the latest
  version in CPython 3.7 (git rev 5fe59f8).
* The compiler tries to find a usable exception return value for cdef functions
  with ``except *`` if the returned type allows it.  Note that this feature is \ 
  to safety limitations, so it is still better to provide an explicit declaration.
* C functions can be assigned to function pointers with a compatible exception
  declaration, not only with exact matches.  A side-effect is that certain compatible
  signature overrides are now allowed and some more mismatches of exception \ 
  are now detected and rejected as errors that were not detected before.
* The IPython/Jupyter magic integration has a new option ``%%cython --pgo`` for \ 
  guided optimisation. It compiles the cell with PGO settings for the C compiler,
  executes it to generate a runtime profile, and then compiles it again using that
  profile for C compiler optimisation.  Currently only tested with gcc.
* ``len(memoryview)`` can be used in nogil sections to get the size of the
  first dimension of a memory view (``shape[0]``).
* C++ classes can now contain (properly refcounted) Python objects.
* NumPy dtype subarrays are now accessible through the C-API.
* Resolves several issues with PyPy and uses faster async slots in PyPy3.

Bugs fixed
* Extension types that were cimported from other Cython modules could disagree
  about the order of fused cdef methods in their call table.  This could lead
  to wrong methods being called and potentially also crashes.  The fix required
  changes to the ordering of fused methods in the call table, which may break
  existing compiled modules that call fused cdef methods across module boundaries,
  if these methods were implemented in a different order than they were declared
  in the corresponding .pxd file.
* The exception state handling in generators and coroutines could lead to
  exceptions in the caller being lost if an exception was raised and handled
  inside of the coroutine when yielding.
* Loops over ``range(enum)`` were not converted into C for-loops.  Note that it
  is still recommended to use an explicit cast to a C integer type in this case.
* Error positions of names (e.g. variables) were incorrectly reported after the
  name and not at the beginning of the name.
* Compile time ``DEF`` assignments were evaluated even when they occur inside of
  falsy ``IF`` blocks.
* Disabling the line tracing from a trace function could fail.
* Several issues with the Pythran integration were resolved.
* abs(signed int) now returns a signed rather than unsigned int.
* Reading ``frame.f_locals`` of a Cython function (e.g. from a debugger or profiler
  could modify the module globals.
* Buffer type mismatches in the NumPy buffer support could leak a reference to the
  buffer owner.
* Using the "is_f_contig" and "is_c_contig" memoryview \ 
methods together could leave
  one of them undeclared.
* Compilation failed if the for-in-range loop target was not a variable but a more
  complex expression, e.g. an item assignment.
* Compile time evaluations of (partially) constant f-strings could show incorrect
* Escape sequences in raw f-strings (``fr'...'``) were resolved instead of passing
  them through as expected.
* Some ref-counting issues in buffer error handling have been resolved.

Other changes
* Type declarations in signature annotations are now parsed according to
  `PEP 484 <https://www.python.org/dev/peps/pep-0484/>`_
  typing.  Only Cython types (e.g. ``cython.int``) and Python builtin types are
  currently considered as type declarations.  Everything else is ignored, but this
  will change in a future Cython release.
* The directive ``annotation_typing`` is now ``True`` by default, which enables
  parsing type declarations from annotations.
* This release no longer supports Python 3.2.