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):

self.__gender=gender

bart = Student('Bart', 'male')

if bart.get_gender() != 'male':

print('测试失败!')

else:

bart.set_gender('female')

if bart.get_gender() != 'female':

print('测试失败!')

else:

print('测试成功!')