human
Here's a good function header given the following:
I wrote the below code

    def f(index, collection):
        if (index == 0):
            return 1
        elif (index == 1):
            return 2
        else:
            return (getattr(collection[(index - 1)], order_col) + getattr(collection[(index - 2)], order_col))
    return f

What's a good function header?
assistant
#Here's a good function header.

def fibonacci_numbering(order_col):