I have a Python application to which I recently added a Cython module. Running it from script with pyximport works fine, but I also need an executable version which I build with cx_Freeze.
Trouble is, trying to build it gives me an executable that raises ImportError trying to import the .pyx module.
I modified my setup.py like so to see if I could get it to compile the .pyx first so that cx_Freeze could successfully pack it:
from cx_Freeze import setup, Executable
from Cython.Build import cythonize
setup(name='projectname',
version='0.0',
description=' ',
options={"build_exe": {"packages":["pygame","fx"]},'build_ext': {'compiler': 'mingw32'}},
ext_modules=cythonize("fx.pyx"),
executables=[Executable('main.py',targetName="myproject.exe",base = "Win32GUI")],
requires=['pygcurse','pyperclip','rsa','dill','numpy']
)
... but then all that gives me is No module named fx within cx_Freeze at build-time instead.
How do I make this work?
The solution was to have two separate calls to setup(); one to build fx.pyx with Cython, then one to pack the exe with cx_Freeze. Here's the modified setup.py:
from cx_Freeze import Executable
from cx_Freeze import setup as cx_setup
from distutils.core import setup
from Cython.Build import cythonize
setup(options={'build_ext': {'compiler': 'mingw32'}},
ext_modules=cythonize("fx.pyx"))
cx_setup(name='myproject',
version='0.0',
description='',
options={"build_exe": {"packages":["pygame","fx"]}},
executables=[Executable('main.py',targetName="myproject.exe",base = "Win32GUI")],
requires=['pygcurse','pyperclip','rsa','dill','numpy']
)
Related
I am trying to invoke a Cython file in a Python script. I have read this answer and followed the instruction. However, even though I have successfully compiled the C code, PyCharm does not recognize the Cython file 'hello.pyx' while executing the import command, as shown in the screenshot below. What is the remedy?
The Cython file hello.c is generated by setup.py the content of which is shown below.
from distutils.core import setup
from Cython.Build import cythonize
setup(name='Hello world app',
ext_modules=cythonize("hello.pyx")
)
When you compile your module with cythonize, the resulting module will be put into a subfolder. By default, this subfolder is not in the PATHS list. To fix this problem you can just move the resulting file .dll file into the folder where your hello.py and hello.pyx are located.
An alternative approach is to add Extension like so:
from distutils.core import setup
from Cython.Build import cythonize
from distutils.extension import Extension
exts = [Extension(name='hello',sources=['hello.pyx'])]
setup(name='Hello world app',
ext_modules=cythonize(exts)
)
And then compile with:
python setup.py build_ext --inplace
This code will put resulting .dll into the same folder as your source files.
I am trying to create a c extension for python on my Raspberry Pi.
My setup.py looks like the following.
My c program uses the wiringPi library.
How do I instruct the setup program to use this library?
Without it, I get the following error.
"ImportError: /usr/local/lib/python2.7/dist-packages/dist_funct.so: undefined symbol: digitalWrite"
from distutils.core import setup, Extension
setup(name='dist_funct', version='1.0',
ext_modules=[Extension('dist_funct', ['dist_funct.c'])])
Explicitly list libraries:
from distutils.core import setup, Extension
setup(
name='dist_funct',
version='1.0',
ext_modules=[
Extension(
'dist_funct',
['dist_funct.c'],
libraries=["wiringPi"],
),
]
)
Extension has a lot of parameters, see the docs.
I have the following package structure:
+ repo/
+ setup.py
+ package/
+ module1/
+ submodule1.py
+ submodule2.pyx
+ module2/
+ submodule3.py
I would like to use submodule2.pyx from submodule1.py by something like:
import submodule2
but I have absolutely no idea how to do this. I tried adding the following lines to my setup.py:
from distutils.core import setup
from setuptools import setup
from Cython.Distutils import build_ext
ext_modules = cythonize(Extension(
"zindex",
sources=["ndmg/graph/zindex.pyx"],
language="c",
))
for e in ext_modules:
e.pyrex_directives = {"boundscheck": False}
setup(
name='ndmg',
ext_modules = ext_modules,
packages=[
'package',
'package.module1',
....
)
but was unsuccessful. All of the tutorials I could find had very very simplified examples, so I am not sure how to include Cython modules in my python package when the rest of the package is all just normal python code. Does anybody have any good examples I could follow, or can somebody tell me what I'm doing wrong?
Thanks in advance!
The name given to cythonize is what Cython will use to call the module and what it will be have to be imported as.
The above setup.py will generate a native extension called zindex and will have to be imported as import zindex even within python files in the zindex package.
Here is an example of how to do this:
from distutils.core import setup
from setuptools import setup
from Cython.Distutils import build_ext
ext_modules = cythonize(Extension(
"ndmg.graph.zindex",
sources=["ndmg/graph/zindex.pyx"],
language="c",
))
<..>
Build and install extension.
In a python file under ndmg/graph/py_index.py you can then do.
from zindex import <..>
to import from the cython module.
I am a beginner in python and I have just got familiar with cython as well. I am using Anaconda on Windows 64-bit. I am trying to run the "helloworld" example as follows:
1- I build a helloworld.pyx file containing:
print("Hello World")
2- I build a setup.py file containing:
from distutils.core import setup
from Cython.Build import cythonize
setup(name='Hello world app',ext_modules=cythonize("helloworld.pyx"),)
But I get the following error:
'helloworld.pyx' doesn't match any files
Could you please tell me what should I do now? Where should I save these two files?
From here: https://github.com/cython/cython/wiki/enhancements-distutils_preprocessing
from distutils.core import setup
from Cython.Build import cythonize
setup(
name = 'MyProject',
ext_modules = cythonize(["*.pyx"]),
)
Looks like cythonize accepts a list of strings, but you're providing a string.
I am constantly working on a Python module which contains C++ extensions wrapped with Cython. The setup.py currently handles the building of the extension module, and is called as python3 setup.py --build_ext --inplace.
from distutils.core import setup
from distutils.extension import Extension
from Cython.Build import cythonize
from Cython.Distutils import build_ext
srcDir = "../src"
src = ["_MyProject.pyx"] # list of source files
print("source files: {0}".format(src))
modules = [Extension("_MyProject",
src,
language = "c++",
extra_compile_args=["-fopenmp", "-std=c++11", "-O3", "-DNOGTEST"],
extra_link_args=["-fopenmp", "-std=c++11"],
libraries=["MyProjectLib", "log4cxx"],
library_dirs=["../"])]
for e in modules:
e.cython_directives = {"embedsignature" : True}
setup(name="_MyProject",
cmdclass={"build_ext": build_ext},
ext_modules=modules)
On top of the Cython module _MyProject, there is a pure Python module MyProject which imports stuff from _MyProject.
Currently I use and test the module by cd-ing into its directory and importing it from there. How do I need to modify my setup.py so that I can install MyProject into my site packages and have the package always up to date?
Add the argument py_modules = ["MyProject.py",] to your setup() function.