Class inherit PyThon3

Code:

class Person:
 
    def __init__(self, name, age, sex):
        self.name = name
        self.age = age
        self.sex = sex
 
    def desc(self):
        print("name:{},age:{},sex:{}".format(self.name,self.age,self.sex))
 
class Student(Person):
     def __init__(self, name,age,sex,school):
         self.name = name
         self.age = age
         self.sex = sex
         self.school = school
 
     def desc_stu(self):
         print("name:{},age:{},sex:{},school:{}".format(self.name,self.age,self.sex,self.school))
 
if __name__ == '__main__':
      stu = Student("张三","18","男","清华")
      stu.desc_stu()
      stu.desc(

operation result:

name: Joe Smith, Age: 18 , Sex: Male, school: Tsinghua 
name: Joe Smith, Age: 18, Sex: Male