Mailman 3 February 2016 - cython-devel

Google Summer of Code 2016, GSoC2016
by Raniere Silva Feb. 8, 2016

Feb. 8, 2016

Hi all, Since Cython is a NumFOCUS affiliated project and NumFOCUS will apply to be a mentoring organization on GSoC I want to know (1) if Cython is planning to apply this year and (2) if want to apply under NumFOCUS umbrella. Cython is welcome and encouraged to apply as separate mentoring organizations directly with Google. We're happy to help you fill out your application and improve your ideas pages, as well as link your page to help students find you. We may also be able to be a reference for you. It is totally fine if you want to use the NumFOCUS umbrella org as a backup plan in case you don't get selected and we do! Cheers, Raniere

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NumPy C API Status?
by Marvin Ritter Feb. 2, 2016

Feb. 2, 2016

Hi, I have to use the NumPy C API for my current project and it seems that Cython 0.23.4 it only shipping definitions for on all version of the API. But I need some of the newer methods. What are your plans on updating? Is there anything that prevents you? And if not, how complicated is it? Could a novice like me do it? Thanks Marvin

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C++ structs, namespace, and auto-conversion of struct to dict
by Kevin Thornton Feb. 2, 2016

Feb. 2, 2016

Hi, I recently ran into an issue where I found that Cython will not generate code to auto-convert structs do dicts if the struct is declared in a C++ namespace. The issue has also been discussed here: http://stackoverflow.com/questions/29603562/auto-conversion-of-structs-to-d… While there are obvious workarounds, none of them are ideal. Is there a road map for addressing this issue? If not, what would it take to do so, and where in the code should one start looking? Thanks, Kevin

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Cython 0.23.4: Crash with Template Stuff
by Elizabeth Fischer Feb. 2, 2016

Feb. 2, 2016

Cython is crashing on me when I compile. See below. -- Elizabeth cython --version Cython version 0.23.4 Error compiling Cython file: ------------------------------------------------------------ ... # cdef int flags def test_double_blitz(a): cdef vector[int] v cdef cblitz.Array[double,1] a_b a_b = cibmisc.np_to_blitz[double,1](a, b'var', [-1]) ^ ------------------------------------------------------------ /Users/rpfische/git/ibmisc/pylib/ibmisc.pyx:38:26: Compiler crash in AnalyseExpressionsTransform ModuleNode.body = StatListNode(ibmisc.pyx:1:0) StatListNode.stats[3] = StatListNode(ibmisc.pyx:35:0) StatListNode.stats[0] = DefNode(ibmisc.pyx:35:0, modifiers = [...]/0, name = 'test_double_blitz', num_required_args = 1, py_wrapper_required = True, reqd_kw_flags_cname = '0', used = True) File 'Nodes.py', line 430, in analyse_expressions: StatListNode(ibmisc.pyx:36:1) File 'Nodes.py', line 4775, in analyse_expressions: SingleAssignmentNode(ibmisc.pyx:38:36) File 'Nodes.py', line 4887, in analyse_types: SingleAssignmentNode(ibmisc.pyx:38:36) File 'ExprNodes.py', line 4640, in analyse_types: SimpleCallNode(ibmisc.pyx:38:36, analysed = True, result_is_used = True, use_managed_ref = True) File 'ExprNodes.py', line 3109, in analyse_types: IndexNode(ibmisc.pyx:38:26, is_called = 1, is_subscript = True, result_is_used = True, use_managed_ref = True) File 'ExprNodes.py', line 3419, in analyse_base_and_index_types: IndexNode(ibmisc.pyx:38:26, is_called = 1, is_subscript = True, result_is_used = True, use_managed_ref = True) Compiler crash traceback from this point on: File "/Users/rpfische/macports/mpgompi-4.9.3/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/Cython/Compiler/ExprNodes.py", line 3419, in analyse_base_and_index_types elif len(base_type.templates) != len(self.type_indices): TypeError: object of type 'NoneType' has no len() make[2]: *** [pylib/ibmisc.cpp] Error 1 make[2]: *** Deleting file `pylib/ibmisc.cpp' make[1]: *** [pylib/CMakeFiles/ibmisc_so.dir/all] Error 2 make: *** [all] Error 2

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Bug: Typed Memoryview and unicode string typ
by Marvin Ritter Feb. 1, 2016

Feb. 1, 2016

Hi, First off all thanks to all of you for this awesome tool, it is working great and I love it :) Also the idea looks cool, I haven't been able to use typed memories views as they seem broken for my setup: Cython 0.23.4 Python 3.4 (and 3.5) Compiler directive: c_string_type=unicode (which should be the same as str in Python 3.x) Steps: cdef int* ptr = <int*>malloc(sizeof(int) * 10) memView = <int[:n]>ptr Result: Compiles, but will raise a TypeError('expected bytes, str found') at runtime I attached a minimal example. Note that if you change the c_string_type to 'bytes' it will work fine. Best Marvin

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