python------面向对象介绍之经典类与新式类的继承顺序

一. 经典类与新式类的继承顺序

1 class A:
     def   __init__(self):
         print("A")
 
 class B(A):
     def __init__(self):
         print("B")
 
 class C(A):
     def __init__(self):
         print("C")
 
 class D(B,C):
     pass
 
 obj = D()

注：python2.x 经典类是按深度优先来继承的，新式类是按广度优先来继承的；

python3.x  经典类和新式类都是按广度优先继承的。

二. 继承实例

 """继承实例"""
 class School(object):
     def __init__(self,name,addr):
         self.name = name
         self.addr = addr
         self.students = []
         self.staffs = []
 
     def enroll(self,stu_obj):
         print("为学员%s 办理注册手续"% stu_obj)
         self.students.append(stu_obj)
     def hire(self,staff_obj):
         print("雇佣新员工 %s" % staff_obj)
         self.staffs.append(staff_obj)
 
 class SchoolMember(object):
     def __init__(self,name,age,sex):
         self.name = name
         self.age = age
         self.sex = sex
     def tell(self):
         pass
 
 class Teacher(SchoolMember):
     def __init__(self,name,age,sex,salary,course):
         super(Teacher,self).__init__(name,age,sex)
         self.salary = salary
         self.course = course
     def tell(self):
         print('''
         ------info of Teacher : %s----
         Name :%s
         Age :%s
         Sex :%s
         Salary :%s
         Course :%s
         '''%(self.name,self.name,self.age,self.sex,self.salary,self.course))
 
     def teach(self):
         print("%s is teaching course[%s]" %(self.name,self.course))
 
 class Student(SchoolMember):
     def __init__(self,name,age,sex,stu_id,grade):
         super(Student,self).__init__(name,age,sex)
         self.stu_id = stu_id
         self.grade = grade
     def tell(self):
         print('''
                 ------info of Student : %s----
                 Name :%s
                 Age :%s
                 Sex :%s
                 Stu_id :%s
                 Grade :%s
                 ''' % (self.name, self.name, self.age, self.sex, self.stu_id, self.grade))
     def pay_tuition(self,amount):
         print("%s has paid tution for $%s" %(self.name,amount))
 
 school = School("天字一号","外太空")
 
 t1 = Teacher("xiaolaizi",20,"m",20000,"english")
 t2 = Teacher("zhangsan",18,"m",200,"chinese")
 
 s1 = Student("lisi",10,"f",110119,"python")
 s2 = Student("wangmaiz",8,"f",110118,"C++")
 
 t1.tell()
 s1.tell()
 school.hire(t1)
 school.enroll(s1)
 
 print(school.students)
 print(school.staffs)
 school.staffs[0].teach()
 
 for stu in school.students:
     stu.pay_tuition(3000)