class Student():

def __init__(self,name,gender):

self.name = name

self.__gender = gender

def get_gender(self):

return self.__gender

def set_gender(self,x):

if x == 'f' or x=='m':

self.__gender = x

else:

print('please enter correct gender!')

cial = Student('Cial','f')

cial.get_gender()

cial.set_gender('m')