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!')