class Student(object):
    def __init__(self, first='', last='', id=0):
        self.first_name_str = first
        self.last_name_str = last
        self.id_int = id
    def update(self, first='', last='', id=0):
        if first:
            self.first_name_str = first
        if last:
            self.last_name_str = last
        if id:
            self.id_int = id
    def __str__(self):
        return "{} {}, ID:{}".\
               format(self.first_name_str, self.last_name_str, self.id_int)

    def __eq__(self,other):
        return self.id == other.id