Python is an interpreted, general-purpose high-level programming language whose design philosophy emphasizes code readability.
Questions tagged [python-extensions]
323 questions
3
votes
1 answer
python3 C extension module with cp1252 encoded string
I am writing a Python3 extension module for an existing C++ library which returns a string that appears to be in cp1252 encoding. The C++ function signature is
int get_name(std::string& name);
where name is the output variable that contains a…
Paul Grinberg
- 1,184
- 14
- 37
3
votes
1 answer
Segmentation fault in C python extension
I'm writing a C extension module for python3.7. I have a simple structure as PyObject:
typedef struct {
PyObject_HEAD
double attacker;
double victim;
double game_hardness;
int inflation;
} RatingSystem;
And initialiser:
static…
pomo_mondreganto
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- 2
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3
votes
0 answers
How to compile a C extension using clang or ICC?
I am trying to compile a python module using a compiler other than 'gcc', specifically 'icc' (for efficiency reasons).
I tried forcing the compilation setting 'cc' to 'clang' but still that did not work as my extension was built using GCC.
Anyway,…
PintoDoido
- 1,011
- 16
- 35
3
votes
1 answer
How to pass a large string from Python to a C++ extension method efficiently?
Introduction
I am working on project where a lot of textual data needs to be processed. Many quite big (hundreds of MB) text files. The python is the requirement (don't ask why). I want to use C++ extensions to increase the performance. I decided to…
nosbor
- 2,826
- 3
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- 63
3
votes
0 answers
Cython: avoid compiling all C/C++ files on each extension. Objective: distribute in PyPi
The Cython project I am currently working on includes some 20 C++ files that act as C++ implementation. On top I have built three Extension Modules written in Cython, each of them capturing different but interconnected functionalities of the C++…
ibarrond
- 6,617
- 4
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- 45
3
votes
0 answers
passing python3 file stream to C++ extern function
Okay there, i have some code in python that opens a file -> process it -> and writes data to other file.
def ELECrypt(myFile, outFile, code):
Code = list(bytes(code,'utf-8'))
with open(myFile, 'rb') as bFil:
with open(outFile, 'wb')…
Richard Tyshchenko
- 46
- 5
3
votes
0 answers
How to convert a PyCapsule into a ctype?
I am trying to get a python c extension to work. The extension is used in a package which registers a python callback with the extension and then the extension calls it to communicate with the python code.
The extension has a struct variable which I…
viterbi
- 419
- 5
- 11
3
votes
4 answers
Error exporting symbol when building Python C Extension in Windows
I'm working on porting a Python module to Windows. I have a toy example as follows.
The folder structure is:
foo/
libfoo/
foo.c
setup.py
setup.py
from setuptools import setup, Extension
sources = ['libfoo/foo.c']
foo =…
nbui
- 182
- 1
- 9
3
votes
2 answers
How to add an alternative constructor to the target language (specifically Python) in SWIG wrapping C++ code
I am creating Python interfaces to some C++ code that I cannot change, using SWIG. One of the C++ classes has a constructor that creates a partially initialized object that cannot be used as yet, an initialization function has to be called on it…
doetoe
- 765
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- 16
3
votes
1 answer
Unable to compile swig generated wrapper for c++ python extension
Hi I am trying the swig python extension, in c++, example - on an Mit page
My header is - shapes.h
#include
class Shape
{
public:
Shape()
{
nshapes++;
}
~Shape()
{
nshapes--;
}
double x,…
Ankit Mishra
- 474
- 3
- 11
3
votes
1 answer
Can't import module created using SWIG
I'm trying to build python extension. I've create simple library that export single function. It's just a single file - testlib.c that implements function called 'apicall'. Then I create SWIG interface file:
%module testlibpy …
Evgeny Lazin
- 9,193
- 6
- 47
- 83
3
votes
1 answer
Python C++ extension Singleton
I'm trying to write a C++ extension for Python (3.x) that allows me to use a specific hardware shield for the Raspberry Pi.
I haven't got any experience in writing C and/or C++, but using the documentation on the Python website, I actually got…
bennierex
- 31
- 1
3
votes
1 answer
Compiling Python extensions with different Visual Studio version
According to the Python documentation, when compiling a Python extension on Windows, "you should use the same version of VC++ that was used to build Python itself". The explanation usually given is that the mismatch in VC runtime version will cause…
Ray
- 4,531
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3
votes
1 answer
What's the difference between tp_clear, tp_dealloc and tp_free?
I have a custom python module for fuzzy string search, implementing Levenshtein distance calculation, it contains a python type, called levtree which has two members a pointer to a wlevtree C type (called tree) which does all the calculations and a…
woggioni
- 1,261
- 1
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- 19
3
votes
1 answer
Using multiple modules/types with Python C API?
I've got two different Python extension modules; let's call them A and B. Module A contains a storage class type called container that I want to use within Module B as the return type of a class method.
I can't seem to find any documentation on…
Paul D.
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