Importing cython function: AttributeError: 'module' object has no attribute 'fun'
Importing cython function: AttributeError: 'module' object has no attribute 'fun'
我写了一小段cython代码就是
#t3.pyx
from libc.stdlib cimport atoi
cdef int fun(char *s):
return atoi(s)
setup.py 文件是
from distutils.core import setup
from Cython.Build import cythonize
setup(ext_modules=cythonize("t3.pyx"))
我运行setup.py使用这个命令
python setup.py build_ext --inplace
这给了我
Compiling t3.pyx because it changed.
Cythonizing t3.pyx
running build_ext
building 't3' extension
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict- prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g -fstack-protector- strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c t3.c -o build/temp.linux-x86_64-2.7/t3.o
t3.c:556:12: warning: ‘__pyx_f_2t3_fun’ defined but not used [-Wunused-function]
static int __pyx_f_2t3_fun(char *__pyx_v_s) {
^
x86_64-linux-gnu-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -Wl,-Bsymbolic-functions -Wl,-z,relro -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security build/temp.linux-x86_64-2.7/t3.o -o /home/debesh/Documents/cython/t3/t3.so
当我在 python 解释器中 运行 它显示我
>>> import t3
>>> t3.fun('1234')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'fun'
>>>
这里的问题是您使用 cdef 而不是 def 定义了您的方法。 cdef 方法只能从 cython 代码调用。
您可以在文档的 Python functions vs. C functions 部分找到详细信息。
Python functions are defined using the def statement, as in Python.
They take Python objects as parameters and return Python objects.
C functions are defined using the new cdef statement. They take either
Python objects or C values as parameters, and can return either Python
objects or C values.
和重要部分：
Within a Cython module, Python functions and C functions can call each
other freely, but only Python functions can be called from outside the
module by interpreted Python code. So, any functions that you want to
“export” from your Cython module must be declared as Python functions
using def.
我写了一小段cython代码就是
#t3.pyx
from libc.stdlib cimport atoi
cdef int fun(char *s):
return atoi(s)
setup.py 文件是
from distutils.core import setup
from Cython.Build import cythonize
setup(ext_modules=cythonize("t3.pyx"))
我运行setup.py使用这个命令
python setup.py build_ext --inplace
这给了我
Compiling t3.pyx because it changed.
Cythonizing t3.pyx
running build_ext
building 't3' extension
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict- prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g -fstack-protector- strong -Wformat -Werror=format-security -fPIC -I/usr/include/python2.7 -c t3.c -o build/temp.linux-x86_64-2.7/t3.o
t3.c:556:12: warning: ‘__pyx_f_2t3_fun’ defined but not used [-Wunused-function]
static int __pyx_f_2t3_fun(char *__pyx_v_s) {
^
x86_64-linux-gnu-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -Wl,-Bsymbolic-functions -Wl,-z,relro -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security build/temp.linux-x86_64-2.7/t3.o -o /home/debesh/Documents/cython/t3/t3.so
当我在 python 解释器中 运行 它显示我
>>> import t3
>>> t3.fun('1234')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'fun'
>>>
这里的问题是您使用 cdef 而不是 def 定义了您的方法。 cdef 方法只能从 cython 代码调用。
您可以在文档的 Python functions vs. C functions 部分找到详细信息。
Python functions are defined using the def statement, as in Python. They take Python objects as parameters and return Python objects.
C functions are defined using the new cdef statement. They take either Python objects or C values as parameters, and can return either Python objects or C values.
和重要部分：
Within a Cython module, Python functions and C functions can call each other freely, but only Python functions can be called from outside the module by interpreted Python code. So, any functions that you want to “export” from your Cython module must be declared as Python functions using def.