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?