cython_capi | Where is __pyx_capi__? | Data Manipulation library

 by   ashwinvis Python Version: Current License: GPL-3.0

kandi X-RAY | cython_capi Summary

kandi X-RAY | cython_capi Summary

cython_capi is a Python library typically used in Utilities, Data Manipulation applications. cython_capi has no vulnerabilities, it has a Strong Copyleft License and it has low support. However cython_capi has 4 bugs and it build file is not available. You can download it from GitHub.

Demonstrates without using api keyword how __pyx_capi__ attribute is generated by Cython. How it requires pyx and pxd files to be in-place during build_ext step. Simple build_ext without packaging, in-place build_ext with packaging (see: setup_pkg_inplace.py). When build_ext is done with packaging using the Cython sources in some other directory (see setup_pkg.py). A Cython interface to a C++ class in Rectangle.cpp. Attempt to access a C++ bound method getArea. Modified api can export PyCapsules for regular Cython functions alone, not for bound methods in Cython classes. Pythran cannot have a struct type as an argument; thus Pythran fails to compile. A pyx file containing a function which adds 2 arrays / memory-views and another pyx file which adds integers. Also, Pythran file which includes similar add functions and a Pythran exported PyCapsule. PyCapsules exported using Cython (api) and Pythran is fed into the Pythran function. For integer type: Pythran calling Pythran-PyCapsule and Cython-PyCapsule. For array type: Pythran calling Pythran-PyCapsule. Direct Cython function calls. For array type: Pythran calling Cython-PyCapsule. Revisiting the Rectangle.cpp example, now with manually created PyCapsules through Cython. A cpdef function which works as a wrapper to access the getArea C++ bound method: only has int as argument and return types. Different kinds of twice functions of unbound cdef type and bound cpdef and static types. A cleaner version of the previous case, containing only "twice-functions". -ditto- and an attempt to write a C code with Python API to call the PyCapsule. Trying to use the Rectangle.cpp now with a bound-method with pointer arguments. Unable to manually generate PyCapsules. "Twice-functions" for an array of floats instead of a scalar int. Manually creating PyCapsules using make_PyCapsule function. Calling unbound and bound methods of cdef/cpdef/static types with memoryview/ndarray argument types from Pythran with the PyCapsules. Instead of Pythran, we try to call PyCapsules using scipy.LowLevelCallable feature. It extends the integrate.nquad example found in SciPy docs. We use Cython instead of ctypes to generate the LowLevelCallable for the same example. Cython function using double* argument. Cython function using a memoryview or numpy argument (Could be something related to SciPy internals, since scipy does a preliminary type checking using the PyCapsule's signature).
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            kandi-support Support

              cython_capi has a low active ecosystem.
              It has 8 star(s) with 3 fork(s). There are 1 watchers for this library.
              OutlinedDot
              It had no major release in the last 6 months.
              cython_capi has no issues reported. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of cython_capi is current.

            kandi-Quality Quality

              OutlinedDot
              cython_capi has 4 bugs (4 blocker, 0 critical, 0 major, 0 minor) and 1 code smells.

            kandi-Security Security

              cython_capi has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              cython_capi code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              cython_capi is licensed under the GPL-3.0 License. This license is Strong Copyleft.
              Strong Copyleft licenses enforce sharing, and you can use them when creating open source projects.

            kandi-Reuse Reuse

              cython_capi releases are not available. You will need to build from source code and install.
              cython_capi has no build file. You will be need to create the build yourself to build the component from source.
              It has 379 lines of code, 44 functions and 32 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed cython_capi and discovered the below as its top functions. This is intended to give you an instant insight into cython_capi implemented functionality, and help decide if they suit your requirements.
            • Call a capsule .
            • Add int caps to f
            • Add a capsule to f
            • Add a function to a function .
            • Calculates the fractional capulus
            • Apply func to a function .
            • Get the area of the rectangle
            Get all kandi verified functions for this library.

            cython_capi Key Features

            No Key Features are available at this moment for cython_capi.

            cython_capi Examples and Code Snippets

            No Code Snippets are available at this moment for cython_capi.

            Community Discussions

            QUESTION

            Wrong result using a PyCapsule created from a method in Cython
            Asked 2017-Dec-04 at 21:39

            We would need to create a PyCapsule from a method of a class in Cython. We managed to write a code which compiles and even runs without error but the results are wrong.

            A simple example is here: https://github.com/paugier/cython_capi/tree/master/using_cpython_pycapsule_class

            The capsules are executed by Pythran (one needs to use the version on github https://github.com/serge-sans-paille/pythran).

            The .pyx file:

            ...

            ANSWER

            Answered 2017-Dec-04 at 21:39

            To follow up/expand on my comments:

            The basic issue is that the Pythran is expecting a C function pointer with the signature int f(int) to be contained within the PyCapsule. However, the signature of your methods is int(PyObject* self, int c). The 2 gets passed as self (not causing disaster since it isn't actually used...) and some arbitrary bit of memory is used in place of the int c. Unfortunately it isn't possible to use pure C code to create a C function pointer with "bound arguments" so Cython can't (and realistically won't be able to) do it.

            Modification 1 is to get better compile-time type checking of what you're passing to your PyCapsules by creating a function that accepts the correct types and casting in there, rather than just casting to blindly. This doesn't solve your problem but warns you at compile-time when it isn't going to work:

            Source https://stackoverflow.com/questions/47623241

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install cython_capi

            You can download it from GitHub.
            You can use cython_capi like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.

            Support

            https://github.com/pelson/calling_publicly_declared_cython_from_chttps://gist.github.com/insertinterestingnamehere/df7894b414a94a4456c5
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            gh repo clone ashwinvis/cython_capi

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            git@github.com:ashwinvis/cython_capi.git

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