Question

我正在尝试在cython中编写以下代码进行编译

from cython_gsl cimport *

import atexit

cdef gsl_rng_type * rng_T = gsl_rng_default
cdef gsl_rng * rng_r

gsl_rng_env_setup()
rng_r = gsl_rng_alloc(rng_T)

@atexit.register
def free_gsl_rng():
    gsl_rng_free(rng_r)

但是我总是得到错误

分配给非左值'atexit'

对应的.pxd文件

from cython_gsl cimport *

cdef gsl_rng * rng_r

我实际上是用SageMath 8.7编译的，

sage setup.py build_ext --inplace

这是我的setup.py

from distutils.core import setup
from distutils.extension import Extension
from Cython.Distutils import build_ext
from Cython.Build import cythonize
import cython_gsl

extensions = [
        Extension("gsl_rand", ["gsl_rand.pyx"],
            libraries=cython_gsl.get_libraries(),
            library_dirs=[cython_gsl.get_library_dir()],
            include_dirs=[cython_gsl.get_cython_include_dir()]
            ),
        ]

setup(
        name='Simulation of k-cut on conditional Galton-Watson trees',
        cmdclass={'build_ext': build_ext},
        include_dirs = [cython_gsl.get_include()],
        ext_modules=cythonize(extensions),
        )

Full error log here

sage setup.py build_ext --inplace
Compiling gsl_rand.pyx because it changed.
[1/1] Cythonizing gsl_rand.pyx
/home/xing/Downloads/software/sage/8.7/local/lib/python2.7/site-packages/Cython/Compiler/Main.py:367: FutureWarning: Cython directive 'language_level' not set, using 2 for now (Py2). This will change in a later release! File: /home/xing/Dropbox/Research/2017/k-cut/GW/sage/moments/cython-v5/gsl_rand.pxd
  tree = Parsing.p_module(s, pxd, full_module_name)
warning: /home/xing/Downloads/software/sage/8.7/local/lib/python2.7/site-packages/cython_gsl/gsl_integration.pxd:65:9: 'GSL_EMAXITER' redeclared 
warning: /home/xing/Downloads/software/sage/8.7/local/lib/python2.7/site-packages/cython_gsl/gsl_integration.pxd:67:9: 'GSL_EROUND' redeclared 
warning: /home/xing/Downloads/software/sage/8.7/local/lib/python2.7/site-packages/cython_gsl/gsl_integration.pxd:69:9: 'GSL_ESING' redeclared 
warning: /home/xing/Downloads/software/sage/8.7/local/lib/python2.7/site-packages/cython_gsl/gsl_integration.pxd:71:9: 'GSL_EDIVERGE' redeclared 
warning: gsl_rand.pyx:14:0: Overriding cdef method with def method.

Error compiling Cython file:
------------------------------------------------------------
...
# cython: profile=False

from cython_gsl cimport *

import atexit
      ^
------------------------------------------------------------

gsl_rand.pyx:5:7: Assignment to non-lvalue 'atexit'

Error compiling Cython file:
------------------------------------------------------------
...
cdef gsl_rng * rng_r

gsl_rng_env_setup()
rng_r = gsl_rng_alloc(rng_T)

@atexit.register
^
------------------------------------------------------------

gsl_rand.pyx:13:0: Object of type 'int (void (*)(void) nogil) nogil' has no attribute 'register'
Traceback (most recent call last):
  File "setup.py", line 29, in <module>
    ext_modules=cythonize(extensions),
  File "/home/xing/Downloads/software/sage/8.7/local/lib/python2.7/site-packages/Cython/Build/Dependencies.py", line 1097, in cythonize
    cythonize_one(*args)
  File "/home/xing/Downloads/software/sage/8.7/local/lib/python2.7/site-packages/Cython/Build/Dependencies.py", line 1220, in cythonize_one
    raise CompileError(None, pyx_file)
Cython.Compiler.Errors.CompileError: gsl_rand.pyx

Answer 1

atexit与from cython_gsl cimport *一起导入。 from libc.stdlib cimport *行似乎发生了这种情况。因此，该名称与Python atexit模块冲突。我认为这是一个很好的示例，说明了为什么在您的代码和cython_gsl的代码中都不推荐from something [c]import * 。由于Cython具有两种类型的名称（对于Python和C），因此您会感到更加困惑。

最好的解决方案是执行cimport cython_gsl或导入所需的特定符号：from cython_gsl cimport gsl_rng, etc。记住要同时更改pyx和pxd文件。

最糟糕的解决方法是在导入atexit模块时重命名import atexit as ae模块。

如何在Cython中使用atexit？

分配给非左值'atexit'

1 个答案: