I want to pass some extra options to the Cython compiler by using extra_compile_args. My setup.py: from distutils.core import setup from Cython.Build import cythonize setup( name = 'Test app',...

I am trying to use explicit relative imports in cython. From the release notes it seems like relative imports should work after cython 0.23, and I'm using 0.23.4 with python 3.5. But I get this str...

I would like to lower the time Scipy's odeint takes for solving a differential equation. To practice, I used the example covered in Python in scientific computations as template. Because odeint ...

I'm working on a project to call C++ from Python. We use Cython for this purpose. When compile by using the command "python3.6 setup.py build_ext --inplace", the compiler "x86_64-linux-gnu-gcc" is ...

I'm building a platform independent cython project where I want to pass compiler args based on the compiler being used. I can guess the compiler based on platform or assume it's the same compiler u...

Suppose I have the following simple example of C++ inheritance in file.h: class Base {}; class Derived : public Base {}; Then, the following code compiles; that is, I can assign std::shared_ptr&lt...

I'm using Cython in CPython 3.6 and I'd like to mark some pointers as "not aliased", to improve performance and be explicit semantically. In C this is done with the restrict (__restrict, ...

pyximport is super handy but I can't figure out how to get it to engage the C++ language options for Cython. From the command line you'd run cython --cplus foo.pyx. How do you achieve the equivalen...

I am trying to wrap an enum class in a c++ header file for use in a cython project. For example, how can this enum class Color {red, green = 20, blue}; be wrapped with Cython.

Quoting the Cython documentation: Cython recognises the usual Python for-in-range integer loop pattern: for i in range(n): ... If i is declared as a cdef integer type, it will optimise this into...

I have a .pyx file in which I define some functions, e.g. cdef double foo(double a) nogil: return 3. * a How could I unit test the behavior of such functions outside the pyx file? Since they ar...

I would like to port an existing c++ library with cython to Python, with the C++ library employing templates. In this case, it is the adevs library. The question is how can I store Python objects ...

I'm trying to find examples of a PyTorch nn.Module class written in Cython for speed but haven't found anything. Suppose I have the below class written in Python, what would the best Cython transla...

I get the following error with Python 3.8 and I don't get that error with Python 3.6. How can I make it work with Python 3.8? In order to reproduce the error, please follow along here: https://gith...

I'd like to know how people debug their Cython code, do they just use terminal debugging as suggested in the Doc? This answer suggests it is possible with DDD, not to knock DDD, but I don't want to...

I'm writing a program in python that simulates the reaction of particles, with the aim of teaching the user about particle reactions. As python was too slow at doing the necessary processing, I tur...

I specifically dont have performace issue with Pands Merge, as other posts suggest, but I've a class in which there are lot of methods, which does a lot of merge on datasets. The class has around...

I have some Cython code that I'd like to run as quickly as possible. Do I need to release the GIL in order to do this? Let's suppose my code is similar to this: import numpy as np # trivial defini...

So I'd like to call some python code from c via cython. I've managed to call cython code from c. And I can also call python code from cython. But when I add it all together, some things are missing...

I am trying to deploy a python application on aws lambda. It has several large python dependencies, the largest being scipy and numpy. The result is that my application is significantly larger than...

My cython / pyximport code works very well on a read/write filesystem. But (for testing purposes), I need to try it on a read only filesystem. How to change the cython / pyximport temporary direc...

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....

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 ...

Given an input string, I would like to find the set of all other strings that are within Levenshtein distance 2. For example, if the input string is "aaa" and the alphabet is ['a', 'b'] t...

I'm having trouble when handling pointers with cython. The cython implementation of the class holds a pointer to a C++ instance of class Person. Here's my .pyx file: person.pyx cdef class PyPers...