#!/usr/bin/python3
'''
Module for say_my_name function
'''


def say_my_name(first_name, last_name=""):
    '''Function that prints
    My name is <first name> <last name>
    '''

    if type(first_name) != str:
        raise TypeError("first_name must be a string")
    if type(last_name) != str:
        raise TypeError("last_name must be a string")

    print("My name is {} {}".format(first_name, last_name))
