将参数传递给Python C API函数调用

Question

我正在尝试从C ++调用python函数。但是，我不知道如何将参数传递给python函数调用。

我有一个名为“ arbName.py”的python文件和一个名为“ main.cpp”的c ++文件。

arbName.py

def someFunction(a):
    return a

main.cpp

#include <Python.h>
int main()
{
    Py_Initialize();
    //add . to path
    PyRun_SimpleString("import sys");
    PyRun_SimpleString("sys.path.append(\".\")");

    PyObject* myModuleString = PyUnicode_FromString((char*)"arbName");
    PyObject* myModule = PyImport_Import(myModuleString);
    PyObject* myFunction = PyObject_GetAttrString(myModule,(char*)"someFunction");

    //couldn't figure out this part. 
    //How to declare a python variable and/or pass it to the python function.
    PyObject* args = PyUnicode_FromString("1");
    PyObject *myResult = PyObject_CallFunctionObjArgs(myFunction, args);
    return 0;
}

编辑：我可以通过更改最后两行来实现

PyObject* args = Py_BuildValue("(d)", 2.0);
PyObject *myResult = PyObject_CallObject(myFunction, args);