How do I handle a Python function that returns multiple lists
Python script:
display():
a = [ 'a','b','abc']
b = [ 1 , 2 , 3]
return [a,b]
snippet of the c function calling the above python function:
pValue,pValue1 = PyObject_CallObject(pFunc, pArgs);
Is this the right way to call the function ? But then I cannot use the objects to extract the list values. What am I doing wrong ?
PyObject *ret;
ret=PyObject_CallObject(pFunc,pArgs);
PyObject *ob1,*ob2;
PyArg_ParseTuple(ret,"oo",ob1,ob2); //o-> pyobject |i-> int|s-> char*
This is how you do it.
PyArg_ParseTuple(ret, "O|O:ref", &ob1, &ob2) worked for me.All Python functions/methods return one 'thing', but that 'thing' can be a 'container'. You keep asking how to return multiple lists; what you want to do is return a tuple, or a list, which contains the 'multiple lists' you want to return. Then, in the calling code, you access the elements of the tuple or list to get to the 'multiple lists' you want to return.
You don't receive two objects, you receive a new reference to PyTuple that is actually returned by your function.
return (a,b)returns a tuple. a single object. in C you are trying to read the results as if it is 2 objects. try returning[a,b]instead. since lists are easier to handle than tuples i think. my c is very rusty.