python - Importing cython function: AttributeError: 'module' object has no attribute 'fun' -


i have written small cython code is

#t3.pyx libc.stdlib cimport atoi  cdef int fun(char *s):         return atoi(s)

the setup.py file is

from distutils.core import setup cython.build import cythonize  setup(ext_modules=cythonize("t3.pyx"))

i run setup.py using command

python setup.py build_ext --inplace

this gives me 

compiling t3.pyx because 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 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

when run in python interpreter shows me

>>> import t3 >>> t3.fun('1234') traceback (most recent call last):   file "<stdin>", line 1, in <module> attributeerror: 'module' object has no attribute 'fun' >>>

the problem here defined method cdef instead of def. cdef methods can called cython code.

you can find detailed information in python functions vs. c functions section of docs.

python functions defined using def statement, in python. take python objects parameters , return python objects.

c functions defined using new cdef statement. take either python objects or c values parameters, , can return either python objects or c values.

and important part:

within cython module, python functions , c functions can call each other freely, python functions can called outside module interpreted python code. so, functions want “export” cython module must declared python functions using def.


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