class Student(object):

    def __init__(self, name, grade):
        self.name, self.grade = name, grade

    def __lt__(self, other):
        return self.name < other.name

# only in python2
#    def __cmp__(self, other):
#        return self.grade - other.grade


sally = Student('Sally', 90)
susan = Student('Susan', 90)
print(sally < susan)
print(sally > susan)
print(sally >= susan)