How Can I Retrieve the Return Value of a Python Method Called from C/C ?

Extracting the Return Value of a Python Method Called from C/C

The article demonstrates how to call a Python method from C/C and extract its return value. While the provided code in the question can effectively print the result to stdout, it does not offer a way to capture the value for further manipulation in C.

The recommended approach involves utilizing the methods provided by the Python C-API, which enables direct interaction with Python objects and functions. Here's an example of how to modify the code to extract the return value:

PyObject* myModuleString = PyString_FromString((char*)"mytest");
PyObject* myModule = PyImport_Import(myModuleString);
PyObject* myFunction = PyObject_GetAttrString(myModule, (char*)"myabs");
PyObject* args = PyTuple_Pack(1, PyFloat_FromDouble(2.0));
PyObject* myResult = PyObject_CallObject(myFunction, args);
double result = PyFloat_AsDouble(myResult);

In this code, we first import the module, obtain a reference to the function, create a tuple with the argument for the function, call the function, and finally extract the return value as a double.

To ensure proper handling, it is essential to manage errors appropriately, as suggested by Mark Tolonen in the comments. For more information and intricate use cases, refer to the Python C-API documentation at http://docs.python.org/c-api/.

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