How to import and use user defined classes in robot framework with python

Assume I have a class in python:

class TestClass(object):
    def __init__(self, arg1, arg2):
        self.arg1 = arg1
        self.arg2 = arg2

    def print_args(self):
        print arg1, arg2

I want to use robotframework to implement my tests scenarios. I want to make an instance from above class and call its methods. How to do that? I know how to import the lib; it should be like this:

Library   TestClass

I don't know how to initialize an object from this class and call class methods via this object. If I wanted to implement it with python, I would write some piece of code like this:

import TestClass
test = TestClass('ARG1', 'ARG2')
test.print_args()

Now, I want to know how to write this in robotframework. Any help?