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)