Find comma after sub andd add NodeWithPosition in node

def find_next_comma(self, node, sub):
        """Find comma after sub andd add NodeWithPosition in node"""
        position = (sub.last_line, sub.last_col)
        first, last = find_next_comma(self.lcode, position)
        if first:  # comma exists
            node.op_pos.append(NodeWithPosition(last, first))