#！/usr/bin/env python3
# -*- coding: utf-8 -*-

class Student(object):
    def __init__(self, name, gender):
        self.name = name
        self.__gender = gender
    def get_gender(self):
        return self.__gender
    def set_gender(self, gender):
        if gender != 'male' and gender != 'female':
            raise TypeError('Invalid gender')
        else:
            self.__gender = gender