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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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Python's __radd__ doesn't work for C-defined types

When creating a python (2.7.5) extension that defines a noddy.Noddy type with __radd__ method, it gets a different behavior from a (otherwise equivalent) python defined-class object with a custom __radd__ (the former does not work, while the latter…
Thiago Silva
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Why does SIGINT sent to Python script kill MySQL connection?

I'm having an issue with sending SIGINT's to python scripts which are connecting to a MySQL database using MySQLdb (mysql-python). The python script runs in an infinite loop, and I want to catch the SIGINT and gracefully exit after completing the…
Chris Palmer
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When are the C tp_as_mapping (et al.) methods invoked?

The C PyObject structure contains the fields tp_as_number, tp_as_sequence and tp_as_mapping. In which circumstances are these invoked? Can anybody provide some example Python code which would result in these C methods being called?
isedev
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SWIG interfacing C library to Python (SWIG generated classes are cumbersome to use)

I am using SWIG to generate Python language bindings to my C library. I have managed to build the bindings and exported data structures, but I'm having to jump through some hoops when using the library. For example the C header has data types and…
Homunculus Reticulli
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Cython built extension fails to export data types and functions

I have just managed to build my first C extension for Python, using Cython to call into an existing C library. I declared and defined my data types and functions into logical components (following the logical structure of the C library), and I…
Homunculus Reticulli
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Web Scraping using pythn Jupyter Notebook

I have been attempting web scraping, but I encountered an error that states, "We're sorry but default doesn't work properly without JavaScript enabled. Please enable it to continue." I have tried enabling JavaScript by using…
shubh jain
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Building Python C module on Windows

I am trying to build a 'C' python extension on Windows, the core C code compiles absolutely fine, but I am unable to build the python module using setuptool as I am getting mandlebrot.c(36): fatal error C1083: Cannot open include file: 'stdio.h': No…
Swatcat
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Viewing Data in Python Extensions GDB

Suppose I have a class: class RawMessage(NamedTuple): data: Dict timestamp: float ... The keys and values in this dictionary are probably all integers, but I don't want to state that with certainty. I additionally hvae a core dump file…
awy
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Calling Numpy functions in C++ using Pybind11

After experimenting with Pybind11 to create C++ extensions for Python, I was hoping to write C++ sections for computationally heavy parts of my code. In my particular case, I would like to work with numpy arrays and use a mixture of numpy functions…
stillQuestioning
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Reasons for "Segmentation fault (core dumped)" when using Python extension and FFmpeg

I want to write a Python C extension that includes a function convertVideo() that converts a video from one format to another making use of FFmpeg 3.4.8 (the libav* libaries). The code of the extension is at the end of the question. The extension…
Christian Vorhemus
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How to create Python Stub Files and where to put?

I have a compiled a Python extension. The resulting binary mylib.so file can be imported in the Python script and works fine. Now I am wondering how to write the interface stub file mylib.pyi such, that pylint and the Python language server used in…
Matthias
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Convert std::string to PyObject in C++ in Python3

I am trying to convert std::string to PyObject. std::string st = jsp.updateRoot(people, people); PyObject* pValue = PyBytes_AsString(st); It is not working using the above method. How can I convert?
batuman
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Call `+=` on a PyObject in C++

I'm writing a Python module in C++. At a certain point, I need to add a PyObject of an arbitrary type to another one. In other words, do the same as a += b would do in Python. But I haven't been able to find a function in the API that does that. I…
SU3
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How to find minimum versions of python interpreter and libs using CMake

I am building a C extension using pybind11 with CMake. I used to do this with: find_package(Python3 3.7 REQUIRED) find_package(PythonLibs 3.7 REQUIRED) without any issues. Now I need python 3.8 and changed it to: find_package(PythonInterp 3.8…
Mike
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What is the proper way to structure a Python package with extensions?

Question: What is the proper way to structure and build a Python wheel with C extensions for deployment? Ideally, the user shouldn't need elevated privileges or be required to point environment variables to the contents of the package. What I have…
rgmann
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