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Questions tagged [python-extensions]

Python is an interpreted, general-purpose high-level programming language whose design philosophy emphasizes code readability.

323 questions
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Extending a virtual C++ class exposed via Boost.Python

I am trying to expose this C++ class using Boost.Python: class VAlgorithm { public: VAlgorithm(const char *name); virtual ~VAlgorithm(); virtual bool Initialize() = 0; virtual bool Process() = 0; virtual bool Finalize() = 0; virtual…
Nicola Mori
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Possible memory leaks

Could someone check if there is an memory leak? I am confused. PyObject * somefunc(int function_id, int num_params, int * params){ PyObject * params_list=PyList_New(0); for(int i=0; i < num_params; i++){ PyObject * val =…
user1618103
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Crash calling C++ virtual member from Python extension

I'm trying to write a thin wrapper around some C++ classes to call them from Python. The specific problem is that if virtual is uncommented below then attempting to create a Foo() crashes the interpreter. I'm not interested in rewriting this code as…
Andrew
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Integrating C and Python: ValueError: module functions cannot set METH_CLASS or METH_STATIC

I am making my first venture into integrating C and Python 2.7.3. For starters, I'm just trying to write a C module for Python that can do basic addition. (It is called npfind because once I figure this out, I want to write a find method for…
dpitch40
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Can't load python extension module that exists

I'm trying to use thanos, which creates an extension module at runtime. Thanos is constantly failing as it cannot import that said extension it created at runtime. I am baffled as to why this is the case. At runtime (after compilation) the…
UsAaR33
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Is it possible to include socketmodule.h in Python C extensions?

I'd like to invoke PySocketModule_ImportModuleAndAPI function defined in socketmodule.h in my Python C-extension.
Dmitry Trofimov
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How to convert PyFrameObject to PyObject

Maybe I'm missing something, but here is a problem: I'm tracing python code by C extensions and my trace function got PyFrameObject* frame. Now I want to process the frame by Python code(embedded or converted to C by Cython) but it deals with…
Dmitry Trofimov
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Cython 1.1.2 and const correctness

I am experimenting with Cython to write a python extension for my C library. I have created a setup.py file - but when I try to build my pxd and pyx files, I get an error. After some investigation, it appears that Cython cannot grok functions with…
Homunculus Reticulli
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Build python wheel with precompiled shared library

When building a wheel of a Python extension module, how can I tell setup() to use an existing/precompiled shared library? For awful horrible reasons, the SO/DLL has to be compiled by a build system that cannot be invoked by Python. (FWIW it's…
alexchandel
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How to fix this issue "ERROR: Failed building wheel for insightface"

note: This error originates from a subprocess, and is likely not a problem with pip. ERROR: Failed building wheel for insightface Failed to build insightface ERROR: Could not build wheels for insightface, which is required to install…
kin
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Undefined symbol at runtime. Import Python C++ extension

I have a python package (my_python_package), part of which is a C++ extension (my_ext) with a single function (my_ext_func). The extension depends on my C++ library (libmycpp) and my C++ library depends on libarrow. The problem is that I get an…
Jerome D Walker
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How to type `PyObject* const*` in Cython

Let's take this as an example: reference The definition of the type _PyCFunctionFastWithKeywords is: PyObject *_PyCFunctionFastWithKeywords(PyObject *self, PyObject *const *args, …
Jim
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Python Wheel that includes shared library is built as pure-Python platform independent none-any

I wish to use some C and CUDA code in my Python package (which I then call using ctypes). Because of the CUDA, it doesn't seem to be easy to use the traditional approach of a setuptools Extension, so I instead pre-compile the code to shared…
user3708067
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Cython: Unable to cimport from `.pxd` file

I have a simple project directory and some simple files which failed to compile. Directory structure: cythonize: ROOT |___ cythonize |___ __init__.pxd |___ __init__.py |___ first.pxd |___ first.pyx |___ second.pxd |___…
Jim
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How to write a simple VTune wrapper script on Windows?

Question How do I write a wrapper script for VTune for Windows? The documentation provides a simple wrapper script example for bash: #!/bin/bash # Prefix script echo "Target process PID: $VTUNE_TARGET_PID" # Run VTune collector "$@" # Postfix…
Samufi
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