return python calculation result to excel vba function

I have a question about calling a Python script in my Excel VBA function. For instance, in my Excel VBA function, I have: abc(x,y,z). In this function, I will pass x,y,z to my Python script as input. Python output will then return calculation result to my abc() function. What I want to achieve is as follows:

    function abc(x,y,z)
    ' here x, y, z is the input that will pass to Python
    ' then we call python scripts here with the return value h
    < call Python here>
    abc=h
    end function 

My question is:

1. How to pass x,y,z to Python scripts?
2. How to give my return value h to abc()?