All Questions
Tagged with python-c-api python-extensions
47 questions
0
votes
1
answer
73
views
How to properly deepcopy linked objects in C Extension
In Python, I have a pair of classes like
class Internal:
def __init__(self, ref):
self.ref = ref
class External:
def __init__(self):
self.storage = [1,2,3]
self.int = ...
- 1,538
14
votes
1
answer
911
views
Defining a Python enum in a C extension - am I doing this right?
I'm working on a Python C extension and I would like to expose a custom enum (as in: a class inheriting from enum.Enum) that would be entirely defined in C.
It turned out to not be a trivial task and ...
0
votes
0
answers
60
views
Why should we almost always reassign an object members before decrementing their reference counts?
I was reading through this tutorial in order to learn how to write C extension module to define new types. At some point the following tp_init implementation was given:
static int
Custom_init(...
- 33
1
vote
1
answer
217
views
PyLongObject memory leak
There is a memory leak in my encode method.
static const size_t _bits_per_digit = sizeof(digit) * CHAR_BIT;
/**
* Returns a Python int storing the bitstream of the Elias gamma encoded input list.
*/...
user3310334
1
vote
1
answer
152
views
Use PyObject_Realloc correctly
https://github.com/python/cpython/blob/master/Include/objimpl.h#L83 says
PyObject_Realloc(p != NULL, 0) does not return NULL, or free the memory at p.
PyObject_Realloc doesn't free the memory.
I've ...
user3310334
0
votes
1
answer
103
views
How to combine own C-extension in own Python Package
I created own Python Package in which I want to add own Python C Extension, because in Python Package I'm importing this C-Ext.
I want to install it from local files, not pypi.
I have dist files of C ...
- 905
7
votes
1
answer
4k
views
Including and distributing third party libraries with a Python C extension
I'm building a C Python extension which makes use of a "third party" library— in this case, one that I've built using a separate build process and toolchain. Call this library libplumbus....
- 2,115
1
vote
1
answer
369
views
How to return a pointer to a C++ object to python using boost if the class of that object is declared in another boost module?
Okay, maybe I'm not finding an answer because I'm not sure how to word it, but I have a class called Info and another class called Packet, both are compiled into Python extensions using boost, and I ...
- 798
0
votes
0
answers
27
views
Python C++ module causing a core dump when accessing the same PyObject* attribute more than once [duplicate]
So I've finally managed to import the C module into python. However, I'm getting a core dump when I try to access the attribute of an object more than once. Here's the code:
node.h:
#pragma once
#...
- 798
0
votes
0
answers
46
views
dynamic module does not define init function error when importing .so file compiled with boost python (Python 3.7) [duplicate]
This might have already been posted somewhere else but I couldn't find anything that worked. I have the following libraries / tools installed :
boost:
boost-python36.x86_64
boost-python36-devel.x86_64
...
- 798
1
vote
1
answer
237
views
How to convert a Python deque to a C++ container?
I have to pass a Python deque to a C++ function but I can't find any documentation on how to convert a deque to a C++ container (for this case, either a deque or a vector would do). Searched ...
- 798
1
vote
0
answers
154
views
How fast is PyObject_CallMethod compared to pure python?
I'm trying to optimize some python code by isolating part of the code into a C++ extension. However, since the code is heavily object-oriented, I'll need to set some attributes as PyObject*. My ...
- 798
0
votes
1
answer
315
views
Proper way to call a different method from the same C-extension module?
I'm converting a pure-Python module to a C-extension to familiarize myself with the C API.
The Python implementation is as follows:
_CRC_TABLE_ = [0] * 256
def initialize_crc_table():
if ...
- 270
1
vote
0
answers
533
views
Passing double arrays from Python to C++ extensions
I understand a basic C++ function wrapped for Python looks like this:
int square(int n)
{
return n*n;
}
static PyObject* square_wrapper(PyObject* self, PyObject* args)
{
int n = 0;
if(!...
1
vote
1
answer
2k
views
Passing byte string from Python to C
I am writing a python extension in C and I am trying to pass a bytes object to my function. Obviously the 's' token is for strings; I have tried 'O', 'N', and a few others with no luck. Is there a ...
- 597