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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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How to pass --debug to build_ext when invoking setup.py install?

When I execute a command python setup.py install or python setup.py develop it would execute build_ext command as one of the steps. How can I pass --debug option to it as if it was invoked as python setup.py build_ext --debug? UPDATE Here is a…
Gill Bates
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Data corruption: Where's the bug‽

Last edit: I've figured out what the problem was (see my own answer below) but I cannot mark the question as answered, it would seem. If someone can answer the questions I have in my answer below, namely, is this a bug in Cython or is this Cython's…
Michael Trausch
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Correct cyclic garbage collection in extension modules

Two sections of Python 2.7's documentation mentioned adding cyclic garbage collection (CGC) support for container objects defined in extension modules. The Python/C API Reference Manual gives two rules, i.e., The memory for the object must be…
liuyu
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Do function pointers remain valid across processes?

I have written an extension module that uses C++ function pointers to store sequences of function calls. I want to 'run' these call sequences in separate processes using python's multiprocessing module (there's no shared state, so no synchronization…
vsekhar
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Python C Extension: Fatal Python error: PyThreadState_Get: no current thread

I am trying to build a C based Python extension that uses a ffmpeg libraries. Since there are a bunch of libraries I have to import. I used CMake. I followed the instructions from python doc The build with CMake goes fine without any issues. But…
Gatothgaj
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creating numpy array in c extension segfaults

I'm just trying to start off by creating a numpy array before I even start to write my extension. Here is a super simple program: #include #include #include "Python.h" #include "numpy/npy_common.h" #include…
Alex Z
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Import and use standard Python module from inside Python C extension

I have Python extension module written in C. I want to use in this C code one of the standard Python modules, for example os or shutil. How is best to do this?
zaharpopov
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How to create python C++ extension with submodule that can be imported

I'm creating a C++ extension for python. It creates a module parent that contains a sub-module child. The child has one method hello(). It works fine if I call it as import parent parent.child.hello() > 'Hi, World!' If I try to import my function…
BlacKow
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Cmake on mac os x, link libraries with fullpath

I'm trying to build a python extension with cmake. This is the cmake list: cmake_minimum_required(VERSION 2.8) PROJECT(drtile) set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}) find_package(Vigra REQUIRED) find_package(Boost COMPONENTS python…
Luca Fiaschi
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CMake pybind11 cannot create target because another target with the same name already exists, how to bypass?

I have code which successfully runs. Its CmakeLists.txt is: cmake_minimum_required(VERSION 3.15) project(rotapro3) set(CMAKE_CXX_STANDARD 14) add_executable(rotapro3 main.cpp): I want to use pybind for this project, and following the instructions, I…
user12948426
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1 answer

Cython C-level interface of package: *.pxd files are not found

In a nutshell I try to compile a cython extension called extension2 that cimports a file extension from a self-created package. When building extension2, I get the error that extension.pxd is not found though this file is exactly at the sepcified…
Samufi
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Step from pdb in gdb when debugging c extension

I'm developing a C(++) extension for python. I have a library in C that I wrap using Swig. Unfortunately I have some error that I would like to debug that is within the C extension. My program makes heavy use of MsgBuffer class which I send over a…
hetepeperfan
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Python C Extension Missing Function

While following a C extension for Python tutorial, my module seems to missing its contents. While building and importing the module have no problem, using the function in the module fails. I am using Python 3.7 on macOS. testmodule.c #define…
nedla2004
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`PyTuple_Pack` segfault

I have a function foo in a Python Extension Module that should return a tuple of ints to Python. This can be easily done using Py_BuildValue: static PyObject* foo(PyObject* self, PyObject* args) { int a = 0; int b = 0; /* calculations…
MaxPowers
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How to generate .pyi files for a compiled Python extension?

I build a compiled Python extension (.pyd file) with C++ and pybind11. I would like to generate a single Python interface .pyi file for my .pyd file. There are a few similar questions referring to the mypy stubgen module, however, this one produces…
Alex Tereshenkov
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