I was unable to install cython due to strict version numbering class of Distutils. For example binutils-2.18.50-20080109-2.tar.gz cannot be used along with MinGW for installing cython. The source code documentation says that "The rationale for this version numbering system will be explained in the distutils documentation." I am unable to...
I would like to use the C implementation of a class method (generated from Cython) if it is present, or use its Python equivalent if the C extension is not present. I first tried this: class A(object): try: import c_ext method = c_ext.optimized_method except ImportError: def method(self): retu...
I'm making my first steps with Cython, and I've installed it on my machine according to the instructions in the wiki. Working through the Cython tutorial I got to pyximport, which is supposed to make cython compilation really simple. When I tried using it, though, I got the following error message (reformatted): ImportError: Building m...
I have code that does some very CPU-intensive string manipulations and I was looking for ways to improve performance. (EDIT: I'm doing stuff like finding longest common substring, running lots of regular expressions which might be better expressed as state machines in c, stripping comments from HTML, stuff like that.) I am currently lo...
Hi, I'm trying to follow this tutorial from Cython: http://docs.cython.org/docs/tutorial.html#the-basics-of-cython and I'm having a problem. The files are very simple. I have a helloworld.pyx: print "Hello World" and a setup.py: from distutils.core import setup from distutils.extension import Extension from Cython.Distutils import...
Hi I'm using cython for a correlation calculation in my python program. I have two audio data sets and I need to know the time difference between them. The second set is cut based on onset times and then slid across the first set. There are two for-loops: one slides the set and the inner loop calculates correlation at that point. This m...
If not, is there a way I can guarantee thread safety by programming a certain way? To clarify, when talking about "threadsafe,' I mean Python threads, not OS-level threads. ...
My problem: I've found that processing large data sets with raw C++ using the STL map and vector can often be considerably faster (and with lower memory footprint) than using Cython. I figure that part of this speed penalty is due to using Python lists and dicts, and that there might be some tricks to use less encumbered data structur...
I know a bunch of scripting languages, (python, ruby, lua, php) but I don't know any compiled languages like C/C++ , I wanted to try and speed up some python code using cython, which is essentially a python -> C compiler, aimed at creating C extensions for python. Basically you code in a stricter version of python which compiles into C -...
Today a great friend of mine asked me what are the main differences between the newest Go language and Cython, which is a set of C-extensions for Python. I don't have much knowledge on Python, can anyone tell me why Go is better/worse than Cython? Best regards, Miguel Rentes ...
I'm writing a python wrapper for an old proprietary system with header files, a .lib and some .dlls available to me on Windows. The library that is referenced is in .lib format (header files have references to Borland C & MSC) I've attempted to convert the .lib to a .a file with pexports -- it complains about not being able to load PE ...
I want to call a C library from a Python application. I don't want to wrap the whole API, only the functions and datatypes that are relevant to my case. As I see it, I have three choices: Create an actual extension module in C. Probably overkill, and I'd also like to avoid the overhead of learning extension writing. Use Cython to expos...
I am trying to wrap a header file which has lots of functions like this test.h void test(int N, int* data_in, int* data_out); so that I can use those from numpy. Right now I have the following cython code: test.pyx import numpy as np cimport numpy as np ctypedef np.int_t itype_t cdef extern from 'VolumeForm.h': void _test '...
I'm new to Cython and I'm tring to use Cython to wrap a C/C++ static library. I made a simply example as following. Test.h: #ifndef TEST_H #define TEST_H int add(int a, int b); int multipy(int a, int b); #endif Test.cpp #include "test.h" int add(int a, int b) { return a+b; } int multipy(int a, int b) { return a*b; } ...
Hello, i am trying to subistute a small bit of Python Code with Cython for a speed up. While Cython itself dosen't complain, but gcc does. from __future__ import division import numpy cimport numpy cimport cython def calc_shg(numpy.ndarray[numpy.complex128_t, ndim = 1] par, numpy.ndarray[numpy.complex128_t, ndim = 1]...
Some standard C libraries that I want to access with Cython have a ton of flags. The Cython docs state that I must replicate the parts of the header I need. Which is fine when it comes to functions definitions. They are usually replicated everywhere, docs included. But what about all those magic numbers? If I want to call mmap, I can a...
In my installation, numpy's arrayobject.h is located at …/site-packages/numpy/core/include/numpy/arrayobject.h. I wrote a trivial Cython script that uses numpy: cimport numpy as np def say_hello_to(name): print("Hello %s!" % name) I also have the following distutils setup.py (copied from the Cython user guide): from distutils.c...
Hello, is their any way to make this work, without sacrificing the cdef in cdef caller? (no use of cpdef either) from array import * from numpy import * cdef class Agents: cdef public caller(self): print "caller" A[1].called() cdef called(self): print "called" A = [Agents() for i in range(2)] def mai...
I know what Cythons purpose is. It's to write compilable C extensions in a Python-like language in order to produce speedups in your code. What I would like to know (and can't seem to find using my google-fu) is if Cython can somehow compile into an executable format since it already seems to break python code down into C. I already u...
I was trying to speed up some code, and then I tried compiling a class and a function using cython and WOW! I havn't measured it yet but it looks at least 10x faster. I first looked at cython just two days ago, I'm very impressed! However, I can't get eval() to work. def thefirst(int a): d = eval('1+2+a') return d I compil...