python 学习_第三模块 面向对象（中级）

1.组合

#
# 组合的使用
class People:
    def __init__(self,name,age,sex):
        self.name = name
        self.age = age
        self.sex = sex

class Teacher(People):
    def __init__(self,name,age,sex,level,salary):
        super().__init__(name,age,sex)
        self.level = level
        self.salary = salary
    def teach(self):
        print("%s is teaching" % self.name)

class Student(People):
    def __init__(self,name,age,sex,class_time):
        super().__init__(name,age,sex)
        self.class_time = class_time
    def learn(self):
        print("%s is learning " % self.name)

class School:
    def __init__(self,school_addr,school_name):
        self.school_addr = school_addr
        self.school_name = school_name
    def tell_info(self):
        print('学校名为 <%s>  学校地址为 <%s>' % (self.school_addr, self.school_name))

class Course:
    def __init__(self,course_name,course_price,course_period):
        self.course_name = course_name
        self.course_price = course_price
        self.course_period = course_period
    def tell_info(self):
        print('课程名<%s> 课程价钱<%s> 课程周期<%s>' % (self.course_name, self.course_price, self.course_period))

class Data:
    def __init__(self,year,mon,day):
        self.year = year
        self.mon = mon
        self.day = day
    def tell_info(self):
        print('%s-%s-%s' %(self.year,self.mon,self.day))

t = Teacher('alex',28,'man',10,3000)
py1 = Course('python','13000','3 month')
linux1 = Course('linux1','11000','2 month')
d = Data(2019,4,3)
s = Student('yangyang',18,'man','08:30:00')

s.birh=d
s.birh.tell_info()
# 2019-4-3

s.course=py1
s.course.tell_info()
# 课程名<python> 课程价钱<13000> 课程周期<3 month>

2.抽象类   接口继承

import abc

class Animal(metaclass=abc.ABCMeta): #只能被继承，不能被实例化
    all_type='animal'

    @abc.abstractmethod
    def run(self):
        pass

    @abc.abstractmethod
    def eat(self):
        pass

class People(Animal):
    def run(self):
        print('people is running')

    def eat(self):
        print('people is eating')

class Pig(Animal):
    def run(self):
        print('people is walking')

    def eat(self):
        print('people is eating')

3.多态

4.封装