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Questions tagged [python-extensions]

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

285 questions
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pylint 1.4 reports E1101(no-member) on all C extensions

We've been long-time fans of pylint. Its static analysis has become a critical part of all our python projects and has saved tons of time chasing obscure bugs. But after upgrading from 1.3 -> 1.4, almost all compiled c extensions result in…
user590028
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Cython compiled C extension: ImportError: dynamic module does not define init function

I have just compiled part of my C library as an extension using Cython, as a "proof of concept". I managed to hack the code (const correctnes problems etc aside), to finally get an extension built. However, when I attempted to import the newly…
Homunculus Reticulli
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Create an object using Python's C API

Say I have my object layout defined as: typedef struct { PyObject_HEAD // Other stuff... } pyfoo; ...and my type definition: static PyTypeObject pyfoo_T = { PyObject_HEAD_INIT(NULL) // ... pyfoo_new, }; How do I create a new…
detly
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Running Cython in Windows x64 - fatal error C1083: Cannot open include file: 'basetsd.h': No such file or directory

I have been trying to install Cython for Python 2.7 on my Window 7 system. In particular, I prefer everything in 64 bits. (In case you wonder, I need Cython because Cython is one of the components I need for another package for some specialized…
Argyll
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What is a PyObject in Python?

Short version I recently came across some Python code in which the return type for a function was specified as PyObject in the documentation. What is a PyObject? Detailed version I am not a C/C++ programmer, but when I ran into PyObject in the…
eric
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Aspect oriented programming (AOP) in Python

Possible Duplicate: Any AOP support library for Python? I am familiar with the AspectJ extension for the Java language. I want to know if there is such a thing for Python. Don't get me wrong, I do not mean a library but a language extension like…
coredump
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Tutorials on optimizing non-trivial Python applications with C extensions or Cython

The Python community has published helpful reference material showing how to profile Python code, and the technical details of Python extensions in C or in Cython. I am still searching for tutorials which show, however, for non-trivial Python…
gotgenes
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Compiler can't find Py_InitModule() .. is it deprecated and if so what should I use?

I am attempting to write a C extension for python. With the code (below) I get the compiler warning: implicit declaration of function ‘Py_InitModule’ And it fails at run time with this error: undefined symbol: Py_InitModule I have spent literally…
Sam Redway
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How to build a Python C Extension so I can import it from a module

I have a Python project with many sub-modules that I package up with distutils. I would like to build some Python extensions in C to live in some of these sub-modules but I don't understand how to get the Python extension to live in a submodule. …
Rich
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How to build and distribute a Python/Cython package that depends on third party libFoo.so

I've written a Python module that depends on some C extensions. Those C extensions depend in turn on several compiled C libraries. I'd like to be able to distribute this module bundled with all the dependencies. I've put together a minimal example…
Sevenless
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Python extension debugging

I'm trying to debug an extension module for python that I wrote in C. I compiled it using the following: python setup.py build -g install --user I then debug with: gdb python ... b py_node_make run test.py It breaks at py_node_make (one of the…
CrazyCasta
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Building 64-bit Python extensions with f2py on Windows

I'm attempting to build a Python extension from Fortran source using Numpy's f2py.py script. I'm following the steps from http://www.scipy.org/F2PY_Windows (web archive). My system is Windows 7 64-bit, and I primarily use Python 2.7.3 [MSC v.1500 64…
Mike T
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Method without return value in python c extension module

I'm trying to create a script in python that sends data through a parallel port. I'm creating my own module in C language. The problem is: when I try to execute my module, python crashes. No errors, no data, nothing. It simply closes. This is my…
markmb
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How can I write a C function that takes either an int or a float?

I want to create a function in C that extends Python that can take inputs of either float or int type. So basically, I want f(5) and f(5.5) to be acceptable inputs. I don't think I can use if (!PyArg_ParseTuple(args, "i", $value)) because it only…
Ansh145
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Pointers and "Storing unsafe C derivative of temporary Python reference"

I was writing code to store a (potentially) very large integer value into an array of chars referenced by a pointer. My code looks like this: cdef class Variable: cdef unsigned int Length cdef char * Array def __cinit__(self, var,…
Woody1193
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