Question

在Cython documentation中，可以使用扩展.pxd将纯python脚本编译为C库。

但是我不能按原样使用该示例。我的最终目标是直接从python模块中将函数和类作为C对象调用（这意味着不在C程序中使用python会话）。

文件为：

foo.py：python模块
foo.pxd：cython编译器的关联头文件
main.c：我需要在其中使用python对象的C程序

foo.py

from __future__ import print_function

def myfunction(x, y=2):
    a = x - y
    res = a + x * y
    print("myfunction:result is:", res)
    return res

def _helper(a):
    res = a + 1
    print("_helper:result is:", res)
    return res

class A:
    def __init__(self, b=0):
        self.a = 3
        self.b = b

    def foo(self, x):
        print(x + _helper(1.0))

foo.pxd

cpdef int myfunction(int x, int y=*)
cdef double _helper(double a)

cdef class A:
    cdef public int a, b
    cpdef foo(self, double x)

main.c

#include <Python.h> //needed
#include <foo.h>

int main(void){
    Py_Initialize();  //Needed!
    initfoo();      //Needed! called PyInit_hello() for Python3
    _helper(3.);
    myfunction(3,2);
    A a;
    a.foo(3.);
    Py_Finalize();    //Needed!
}

Makefile

CC     := gcc
# CFLAGS := $(shell python-config --cflags) -c -fPIC -g -ggdb -O0 -D_DEBUG
CFLAGS := -c -fPIC -g -ggdb -O0 -D_DEBUG -Wall #-Werror
LDFLAGS:= -shared
# CLIBS  := -L$(shell python-config --prefix)/lib $(shell python-config --ldflags)
CLIBS  := -L/usr/local/python-gnu-2.7.8/lib -lpython2.7
RM     := rm -f
CYTHON := cython

INCLUDE_PATH := -I/usr/local/python-gnu-2.7.8/include/python2.7

.PHONY: all clean

NAME := main
CYTHONSRC := foo.py
CYTHONOBJS := $(CYTHONSRC:.py=.so)
LIBS := libfoo.so
SRCS := #main.c # $(wildcard *.c)
OBJS := $(SRCS:.c=.o)

all: $(NAME)

lib: $(LIBS)

#
libfoo.so: foo.o
    $(CC) -I. -L. $(LDFLAGS) $(CLIBS) -o $@ $^
#
# link the .o files into the target executable
#
$(NAME): $(LIBS) $(OBJS)
    $(CC) $(LDFLAGS) $(CLIBS) $(INCLUDE_PATH) $(CFLAGS) -I. -L. -lfoo -o $@ $@.c
#
# compile the .c file into .o files using the compiler flags
#
%.o: %.c
    $(CC) $(CFLAGS) $(INCLUDE_PATH) -I. $<

%.c: %.py
    python -m cython $<
    # $(CYTHON) -o $@ $<

clean:
    $(RM) $(CYTHONSRC:.py=.c)
    $(RM) $(CYTHONSRC:.py=.h)
    $(RM) $(CYTHONSRC:.py=.o)
    $(RM) $(LIBS)
    $(RM) main

编辑：但是make会出现以下错误：

main.c:10:5: error: unknown type name 'A'
     A a;
     ^
main.c:11:6: error: request for member 'foo' in something not a structure or union
     a.foo(3.);
      ^

Cython在纯Python模式下，在C代码中具有python类

0 个答案: