How Can I Call Python Methods and Retrieve Their Return Values from C/C ?

Calling Python Methods and Retrieving Return Values from C/C

In C /C environments, you may encounter scenarios where you need to access functions defined within Python modules. This article will address how to invoke these functions effectively and extract their return values.

Consider the following Python code snippet:

import math

def myabs(x):
    return math.fabs(x)

To call this function from C , you can utilize the Python C-API's features. Begin by including the Python.h header for API access:

#include <Python.h>

To initiate the Python environment, invoke Py_Initialize():

Py_Initialize();

Next, you can import the required Python module:

PyRun_SimpleString("import mytest;");

To execute the custom function, invoke the PyObject_GetAttrString() function to obtain a reference to it, create arguments using the PyTuple_Pack() function, and invoke the function using PyObject_CallObject():

PyObject* myFunction = PyObject_GetAttrString(myModule, "myabs");
PyObject* args = PyTuple_Pack(1, PyFloat_FromDouble(2.0));
PyObject* myResult = PyObject_CallObject(myFunction, args);

Finally, convert the Python return value to a C double using the PyFloat_AsDouble() function:

double result = PyFloat_AsDouble(myResult);

Ensure to handle any potential errors throughout the process by incorporating exception handling mechanisms. This approach provides a comprehensive method for calling Python functions from C/C and accessing their return values.

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