Cython中的ImportError

问题描述

我对cython还很陌生，所以我有一个基本问题.我试图将基类从一个cython文件导入到另一个cython文件中，以定义派生类.我在名为cythonTest/的单个目录中有以下代码:

I'm fairly new to cython, so I have a basic question. I'm trying to import a base class from one cython file into another cython file to define a derived class. I have the following code in a single directory called cythonTest/:

afile.pxd
afile.pyx
bfile.pxd
bfile.pyx
__init__.py
setup.py

afile.pxd:

afile.pxd:

cdef class A:
    pass

afile.pyx:

afile.pyx:

cdef class A:
    def __init__(self):
        print("A__init__()")

bfile.pxd:

bfile.pxd:

from afile cimport A

cdef class B(A):
    pass

bfile.pyx:

bfile.pyx:

cdef class B(A):
    def __init__(self):
        print "B.__init__()"

setup.py:

from distutils.core import setup
from distutils.extension import Extension
from Cython.Build import cythonize

extensions = [Extension("afile", ["afile.pyx"]), 
              Extension("bfile", ["bfile.pyx"])]

setup(ext_modules=cythonize(extensions))

此代码似乎可以正确编译.运行import afile可以正常工作，但是运行import bfile会导致以下错误

This code seems to compile correctly. Running import afile works fine, but running import bfile results in the following error

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "bfile.pyx", line 1, in init cythonTest.bfile
    cdef class B(A):
ImportError: No module named cythonTest.afile

有人知道我在做什么错吗?我正在使用Python 2.7.6和Cython 0.27.3

Does anybody know what I'm doing wrong? I'm using Python 2.7.6 and Cython 0.27.3

推荐答案

您似乎正在使用cythonTest作为程序包名称(包含__init__.py的目录用作程序包).

You seem to be using cythonTest as a package name (directory containing __init__.py used as a package).

模块名称需要在扩展名中反映出来，以便导入才能正常工作:

The module name needs to be reflected in the extension names for importing to work correctly:

extensions = [Extension("cythonTest.afile", ["cythonTest/afile.pyx"]), 
              Extension("cythonTest.bfile", ["cythonTest/bfile.pyx"])]

可能还需要将pyx文件移动到软件包目录下-Cython在构建扩展名时使用软件包名称.

Will also probably need to move the pyx files under the package directory - Cython uses the package name when building the extensions.

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