class Student(object):

def __init__(self, name, gender):
    self.__name = name
    self.__gender = gender

def get_gender(self):
    return self.__gender

def get_name(self):
    return self.__name

def set_gender(self, gender):
    if gender == 'male' or gender == 'female':
        self.__gender = gender
    else:
        raise ValueError('bad gender')