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使distutils在正确的位置查找numpy头文件

cython distutils numpy python

41

Vebjorn Ljosa · 技术社区 · 16 年前

在我的装置中,numpy's arrayobject.h 位于 â¦/site-packages/numpy/core/include/numpy/arrayobject.h . 我写了一个使用numpy的简单的cython脚本:

cimport numpy as np

def say_hello_to(name):
    print("Hello %s!" % name)

我还有下面的distutils setup.py (复制自 Cython user guide ):

from distutils.core import setup
from distutils.extension import Extension
from Cython.Distutils import build_ext

ext_modules = [Extension("hello", ["hello.pyx"])]

setup(
  name = 'Hello world app',
  cmdclass = {'build_ext': build_ext},
  ext_modules = ext_modules
)

当我尝试用 python setup.py build_ext --inplace ,Cython尝试执行以下操作:

gcc -fno-strict-aliasing -Wno-long-double -no-cpp-precomp -mno-fused-madd \
-fno-common -dynamic -DNDEBUG -g -Os -Wall -Wstrict-prototypes -DMACOSX \
-I/usr/include/ffi -DENABLE_DTRACE -arch i386 -arch ppc -pipe \
-I/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5 \
-c hello.c -o build/temp.macosx-10.5-i386-2.5/hello.o

可想而知,这并没有找到 数组对象H . 如何使distuils使用numpy include文件的正确位置(而不让用户定义$cflags)?

3 回复 | 直到 7 年前

1

62

Vebjorn Ljosa 16 年前

使用 numpy.get_include() 以下内容:

from distutils.core import setup
from distutils.extension import Extension
from Cython.Distutils import build_ext
import numpy as np                           # <---- New line

ext_modules = [Extension("hello", ["hello.pyx"])]

setup(
  name = 'Hello world app',
  cmdclass = {'build_ext': build_ext},
  include_dirs = [np.get_include()],         # <---- New line
  ext_modules = ext_modules
)

2

21

R_Beagrie 9 年前

@vebjorn ljosa给出的答案是正确的,但与 install_requires=['numpy'] . 在这种情况下,您的setup.py需要导入numpy,如果尝试导入,这将导致错误。 pip install 你的项目没有运行 pip install numpy 第一。

如果您的项目依赖于numpy,并且您希望将numpy作为依赖项自动安装,则只有在实际构建扩展时才需要设置include dirs。您可以通过子类化来实现这一点。 build_ext :

from distutils.core import setup
from distutils.extension import Extension
from Cython.Distutils import build_ext

class CustomBuildExtCommand(build_ext):
    """build_ext command for use when numpy headers are needed."""
    def run(self):

        # Import numpy here, only when headers are needed
        import numpy

        # Add numpy headers to include_dirs
        self.include_dirs.append(numpy.get_include())

        # Call original build_ext command
        build_ext.run(self)

ext_modules = [Extension("hello", ["hello.pyx"])]

setup(
  name = 'Hello world app',
  cmdclass = {'build_ext': CustomBuildExtCommand},
  install_requires=['numpy'],
  ext_modules = ext_modules
)

您可以使用类似的技巧将cython添加为自动安装的依赖项:

from distutils.core import setup
from distutils.extension import Extension

try:
    from Cython.setuptools import build_ext
except:
    # If we couldn't import Cython, use the normal setuptools
    # and look for a pre-compiled .c file instead of a .pyx file
    from setuptools.command.build_ext import build_ext
    ext_modules = [Extension("hello", ["hello.c"])]
else:
    # If we successfully imported Cython, look for a .pyx file
    ext_modules = [Extension("hello", ["hello.pyx"])]

class CustomBuildExtCommand(build_ext):
    """build_ext command for use when numpy headers are needed."""
    def run(self):

        # Import numpy here, only when headers are needed
        import numpy

        # Add numpy headers to include_dirs
        self.include_dirs.append(numpy.get_include())

        # Call original build_ext command
        build_ext.run(self)

setup(
  name = 'Hello world app',
  cmdclass = {'build_ext': CustomBuildExtCommand},
  install_requires=['cython', 'numpy'],
  ext_modules = ext_modules
)

注:这些方法仅适用于 pip install . .他们不会工作的 python setup.py install 或 python setup.py develop 在这些命令中,会导致依赖项在项目之后而不是之前安装。

3

0

tgbrooks 7 年前

对于不使用cython的任何人来说,在没有依赖关系的情况下,对r_-beagrie的解决方案做一个细微的修改就是从distutils.command.build-ext而不是cython导入build-ext。

from distutils.core import setup
from distutils.extension import Extension
from distutils.command.build_ext import build_ext

class CustomBuildExtCommand(build_ext):
    """build_ext command for use when numpy headers are needed."""
    def run(self):

        # Import numpy here, only when headers are needed
        import numpy

        # Add numpy headers to include_dirs
        self.include_dirs.append(numpy.get_include())

        # Call original build_ext command
        build_ext.run(self)

ext_modules = [Extension("hello", ["hello.c"])]

setup(
  name = 'Hello world app',
  cmdclass = {'build_ext': CustomBuildExtCommand},
  install_requires=['numpy'],
  ext_modules = ext_modules
)