Adafruit_ILI9341 | Library for Adafruit ILI9341 displays

I see at least five problems, with all but two being not checking for NULL values.

You are not checking the return value of PyImport_Import(). If there is a problem/exception while importing the lcd module your code continues as if nothing happened.

Also the return value of PyDict_GetItemString() isn't really checked against NULL. PyCallable_Check() is applied, but it is somewhat redundant because PyObject_CallObject() already checks if the argument is callable.

Of course you are not checking the return value of PyObject_CallObject() if it is NULL.

PyErr_Print() is potentially called even when there is no error/exception which the documentation clearly states will cause a fatal error.

Finally PyInt_AsLong() is called with a potentially uninitialized presult pointer. And given the example code it is definately uninitialized because the Python code contains no initLCD() so pFunc is NULL and presult never gets assigned a value.

So you better initialize each pointer to NULL and check each and every return value.