用Sage在C ++中嵌入python代码

时间:2016-04-11 18:18:00

标签: python c++ embed sage

我试图在C ++中嵌入python代码。我的脚本是(test.py)

from sage.all import *
def f(x):
    //do something
    return c

这是我的C ++代码(main.cpp):

#include <iostream>
#include <stdlib.h>
#include </home/username/.../SageMath/local/include/python2.7/Python.h>
#include <sstream>

int main(int argc, char *argv[]){

PyObject *pName, *pModule, *pDict, *pFunc; PyObject *pArgs, *pValue;
int i;

if (argc < 3) {
    fprintf(stderr,"Usage: call pythonfile funcname [args]\n");
    return 1;
}

Py_Initialize();

pName = PyString_FromString(argv[1]);
/* Error checking of pName left out */

pModule = PyImport_Import(pName);
Py_DECREF(pName);

if (pModule != NULL) {
    pFunc = PyObject_GetAttrString(pModule, argv[2]);
    /* pFunc is a new reference */

    if (pFunc && PyCallable_Check(pFunc)) {
        pArgs = PyTuple_New(argc - 3);
        for (i = 0; i < argc - 3; ++i) {
            pValue = PyInt_FromLong(atoi(argv[i + 3]));
            if (!pValue) {
                Py_DECREF(pArgs);
                Py_DECREF(pModule);
                fprintf(stderr, "Cannot convert argument\n");
                return 1;
            }
            /* pValue reference stolen here: */
            PyTuple_SetItem(pArgs, i, pValue);
        }
        pValue = PyObject_CallObject(pFunc, pArgs);
        Py_DECREF(pArgs);
        if (pValue != NULL) {
            printf("Result of call: %ld\n", PyInt_AsLong(pValue));
            Py_DECREF(pValue);
        }
        else {
            Py_DECREF(pFunc);
            Py_DECREF(pModule);
            PyErr_Print();
            fprintf(stderr,"Call failed\n");
            return 1;
        }
    }
    else {
        if (PyErr_Occurred())
            PyErr_Print();
        fprintf(stderr, "Cannot find function \"%s\"\n", argv[2]);
    }
    Py_XDECREF(pFunc);
    Py_DECREF(pModule);
}
else {
    PyErr_Print();
    fprintf(stderr, "Failed to load \"%s\"\n", argv[1]);
    return 1;
}
Py_Finalize();
return 0;
}

但是,由于我想在我的python脚本中导入sage.all,我必须使用Sage的python,而不是我机器的默认python。然后我做

g++ main.cpp -o main /home/username/.../SageMath/local/lib/libpython2.7.so

它编译,但当我做

./main test f 3

我得到了

from sage.all import *
ImportError: No module named sage.all

原因是它仍在使用我的机器的python而不是Sage的python。我通过添加行

来检查这一点
import sys
print sys.executable

进入我的python脚本,它提供了

/usr/bin/python

我还添加了

#!/home/username/.../SageMath/local/bin/python2.7

到我的python脚本第一行,强制使用Sage的python,但显然它不起作用。

你能帮忙吗?

0 个答案:

没有答案