python中的面向对象

「爱情、让人受尽委屈。」 2021-12-05 02:37 264阅读 0赞

## 1.面向对象基本知识 ##

面向过程：怎么做  
面向对象：谁来做  
1.确定职责 – 要做的事(方法)  
2.对象内部封装不同方法(多个)  
3.不同对象调用不同方法  
类 对象  
类：模板，对象都是根据这个模板创建出来的  
类只需要有一个，对象可以有多个

类：属性(信息)和方法(你能干什么)  
1.类名  
2.属性  
3.方法

举例：  
1.

class Cat():
        def eat(self):
            print('%s爱吃鱼' %self.name)
        def drink(self):
            print('小猫要喝水')
    
    tom = Cat()
    tom.name = 'Tom'
    tom.drink()
    tom1 = Cat()
    # print(tom1)
    tom1.drink()
    print(id(tom))
    print(id(tom1))

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2.

#1.如何定义类  class 类名(): pass
    #2.类创建对象的过程称为实例化，把抽象的类具体化
    # 对象名 = 类名(参数1、参数2...参数n)
    
    #类：模板
    class People():
        #属性：类中的变量
        name = '老李'
        age = 38
    
        #方法：类中的函数
        def eat(self):
            print('吃...')
    
        def sleep(self):
            print('正在睡...')
    
    #实例化：通过类创建对象
    p1 = People()
    p2 = People()
    # print(id(p1))
    # print(id(p2))
    
    print(p1.name)
    print(p2.name)
    
    p1.eat()
    p2.eat()

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## 2.类与对象 ##

\#对象：对象是现实世界或者思维世界中的实体在计算机中的反映  
\#它将数据以及这些数据上的操作封装在一起  
\#类：一类事物的统称，对象是类具体化的产物，也就是示例化  
\#不同的对象有什么不同的特点：比如年龄，性别

class Student():
        name=''
        age=0
    
        def do_homework(self):
            print('homework')
    
    student1=Student()
    student1.do_homework()
    student2=Student()
    student2.do_homework()
    student3=Student()
    student3.do_homework()
    print(id(student1))
    print(id(student2))
    print(id(student3))

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## 3.面向对象三特征之封装 ##

class People():
    
        def __init__(self,name,age):
            #类里的self实质就是对象本身
            #self是对象，name是属性，self.name就是将对象和属性封装在一起
            self.name = name
            self.age = age
    
        def run(self):
            print('%s正在跑步...' %(self.name))
    
    p1 = People('老李',38)
    p1.run()
    
    p2 = People('老吴',36)
    p2.run()
    
    #封装就是把同一类型的东西放在一起，通过self.xxx去调用

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## 4.面向对象三特征之继承 ##

定义一个类，可以从现有的某个类继承  
新的类称为子类、扩展类(Subclass),被继承的称为父类、基类、超类  
(Baseclass、Superclass)

#如何实现继承
    
    #继承的工作机制是什么
    
    class Father():
    
        def __init__(self,name,age):
            #构造方法在实例化对象时自动执行
            self.name = name
            self.age = age
    
        def eat(self):
            print('%s正在吃...' %(self.name))
    
        def sleep(self):
            print('%s正在睡...' %(self.name))
    
    
    class Son(Father):
    
        def eat(self):
            # Father.eat(self)
            super(Son,self).eat()
            print('%s倒立吃饭...' %(self.name))
    
    father = Father('老老李',65)
    son = Son('老李',38)
    
    # son.eat()
    
    #实例化对象默认执行构造方法，子类没有的方法会调用父类的
    #调用父类方法
    son.eat()
    # son.sleep()

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class Animal():
        def eat(self):
            print('吃')
    
        def drink(self):
            print('喝')
    
        def sleep(self):
            print('睡')
    
    class Cat(Animal):
        def yell(self):
            print('喵')
    
    class Jiqimao(Cat):
        def speak(self):
            print('我会说话')
    
    
    jqm = Jiqimao()
    jqm.speak()
    jqm.sleep()
    
    #继承具有传递性，子类拥有父类的父类的属性和方法

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class A():
        def test(self):
            print('A --- test 方法')
        def demo1(self):
            print('A --- demo1方法')
    
    class B():
        def test(self):
            print('B --- test 方法')
        def demo(self):
            print('B --- demo方法')
    
    class C(B,A):
        pass
    
    c = C()
    c.test()
    c.demo1()

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## 5.面向对象三特着之多态性 ##

class Student():
        def get_score(self):
            print('获取学生成绩...')
    
    class Chinese():
        def get_score(self):
            print('获取语文成绩...')
    
    class Math():
        def get_score(self):
            print('获取数学成绩...')
    
    student1 = Student()
    student2 = Chinese()
    student3 = Math()
    student1.get_score()
    student2.get_score()
    student3.get_score()
    
    对扩展开放：允许子类重写方法
    对修改封闭：不修改，直接继承父类方法

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## 6.面向对象方法 ##

**1.str方法**

class People():
    
        def __init__(self,name):
            self.name = name
    
        def __str__(self):
            #必须返回一个字符串
            return '我是 %s' %(self.name)
    
    p1 = People('老李')
    print(p1)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 8]  
需求  
1.小明体重75.0公斤  
2.小明每次跑步会减肥0.5公斤  
3.小明每次吃东西体重会增加1公斤

需求  
1.小明和小美都爱跑步  
2.小美体重45.0公斤  
3.小明体重75.0公斤  
4.每次跑步都会减少0.5公斤  
5.每次吃东西都会增加1公斤

class People():
        def __init__(self,name,weight):
            self.name = name
            self.weight = weight
    
        def __str__(self):
            return '我的名字叫%s，体重是%.2f' %(self.name,self.weight)
    
        def run(self):
            print('%s爱跑步' %(self.name))
            self.weight -= 0.5
    
        def eat(self):
            print('%s吃东西' %(self.name))
            self.weight += 1
    
    xiaoming = People('小明',75)
    xiaoming.run()
    print(xiaoming)
    xiaomei = People('小美',45)
    xiaomei.eat()
    print(xiaomei)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 9]  
**2.类属性方法**

类属性：使用赋值语句在class关键字下定义  
类方法：在类内部可以直接访问类属性或者其他类方法

class Student(object):
        count = 0
    
        def __init__(self,name):
            self.name = name
            Student.count += 1
    
        @classmethod
        def Show_Student_count(awda):
            print('学生数量为 %d' %(awda.count))
    
    student1 = Student('小明')
    Student.Show_Student_count()

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**3.静态方法**

class Cat(object):
    
        @staticmethod
        def call():
            print('喵')
    
    Cat.call()

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**4.私有属性和方法**

class Women():
    
        def __init__(self,name):
            self.name = name
            self.__age = 18
    
        def __secret(self):
            print('%s的年龄是%d' %(self.name,self.__age))
    
    lily = Women('lily')
    # print(lily.name)
    # print(lily.__age)
    lily.__secret()           ##外部无法调用

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class Student(object):
    
        def __init__(self,name,score):
            self.__name = name
            self.__socre = score
    
        def get_name(self):
            return self.__name
    
        def get_score(self):
            return self.__socre
    
        def set_score(self,score):
            self.__socre = score
    
    tom = Student('Tom',89)
    tom.set_score(90)
    print(tom.get_score())
    print(tom.get_name())

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 13]

## 7.面向对象练习 ##

1.士兵打枪  
要求：  
1.士兵瑞恩有一把AK47  
2.士兵可以开火(士兵开火扣动的是扳机)  
3.枪 能够 发射子弹(把子弹发射出去)  
4.枪 能够 装填子弹 --增加子弹的数量

分析：

Soldier                     Gun
    -------------               -----------------
    name                        model
    gun                         bullet_count #子弹数量足够多才能完
    成射击的动作
    -------------               -----------------
    __init__(self):                 __init__(self):
    fire(self):                 (self,count):#装填子弹的
                                方法
                                shoot(self):

代码：

class Gun():
    
        def __init__(self,model):
            self.model = model
            self.bullet_count = 0
    
        def add_bullet(self,count):
            self.bullet_count += count
    
        def shoot(self):
            if self.bullet_count <= 0:
                print('%s没有子弹了...' %self.model)
            else:
                self.bullet_count -= 1
                print('%s...%s' %(self.model,self.bullet_count))
    
    class Soldier():
    
        def __init__(self,name):
            self.name = name
            self.gun = None
    
        def fire(self):
            if self.gun == None:
                print('%s还没枪...' %self.name)
    
            self.gun.add_bullet(5)
            self.gun.shoot()
    
    ak47 = Gun('AK47')
    ak47.add_bullet(20)
    ak47.shoot()
    
    ryan = Soldier('Ryan')
    ryan.gun = ak47
    ryan.fire()

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 14]  
2.图书管理系统

要求：  
图书管理系统  
1.查询图书  
2.增加图书  
3.借阅图书  
4.归还图书  
5.退出系统  
\#书：书名、作者、状态、位置

<table> 
 <thead> 
  <tr> 
   <th>C</th> 
   <th>谭浩强</th> 
   <th>未借出</th> 
   <th>ISO9001</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td>python</td> 
   <td>guido</td> 
   <td>未借出</td> 
   <td>NFS8102</td> 
  </tr> 
  <tr> 
   <td>java</td> 
   <td>westos</td> 
   <td>未借出</td> 
   <td>PKI7844</td> 
  </tr> 
 </tbody> 
</table>

class Book(object):
    
        def __init__(self,name,author,status,bookindex):
            self.name = name
            self.author = author
            self.status = status
            self.bookindex = bookindex
    
        def __str__(self):
            if self.status == 1:
                stats = '未借出'
            elif self.status == 0:
                stats = '已借出'
            else:
                stats = '未知状态'
            return '书名:《%s》 作者: %s 状态: <%s> 位置: %s' \
            %(self.name,self.author,stats,self.bookindex)
    
    class BooKManager(object):
        books = []
    
        def Start(self):
            self.books.append(Book('c','谭浩强',1,'ISO9001'))
            self.books.append(Book('python','guido',1,'NFS8102'))
            self.books.append(Book('java','westos',1,'PKI7844'))
    
        def Menu(self):
            self.Start()
            while True:
                print("""
                        图书管理系统
            1.查询图书
            2.增加图书
            3.借阅图书
            4.归还图书
            5.退出系统
                """)
    
                choice = input('输入您的选择: ')
                if choice == '1':
                    self.ShowAllBook()
                elif choice == '2':
                    self.AddBook()
                elif choice == '3':
                    self.BorrowBook()
                elif choice == '4':
                    self.ReturnBook()
                elif choice == '5':
                    print('欢迎下次使用...')
                    exit()
                else:
                    print('请输入正确选择！')
                    continue
    
        def CheckBook(self,name):
            for book in self.books:
                if book.name == name:
                    return book
            else:
                return None
    
        def ShowAllBook(self):
            for book in self.books:
                print(book)
    
        def AddBook(self):
            name = input('图书名称: ')
            self.books.append(Book(name,input('作者:'),1,input('存储位置:')))
            print('图书《%s》增加成功' %name)
    
        def BorrowBook(self):
            name = input('借阅图书名称: ')
            ret = self.CheckBook(name)
            print(ret)
    
            if ret != None:
                if ret.status == 0:
                    print('书籍《%s》已经借出' %name)
                else:
                    ret.status = 0
                    print('书籍《%s》借阅成功' %name)
            else:
                print('书籍《%s》不存在' %name)
    
        def ReturnBook(self):
            name = input('归还图书名称: ')
            ret = self.CheckBook(name)
    
            if ret != None:
                if ret.status == 0:
                    ret.status = 1
                    print('书籍《%s》归还成功' %name)
                    print(ret)
                else:
                    print('书籍《%s》未借出' %name)
            else:
                print('书籍《%s》不存在' %name)
    
    manage = BooKManager()
    manage.Menu()

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3.给房间安放家具

需求：  
1.房子有户型，总面积和家具名称列表  
新房子没有任何的家具

2.家具有名字和占地面积，其中  
床：占4平米  
衣柜：占2平米  
餐桌：占1.5平米  
3.将以上三件家具添加到房子中  
4.打印房子时，要求输出:户型，总面积，剩余面积，家具名称列表

class Furniture():
    
        def __init__(self,name,area):
            self.name = name
            self.area = area
    
        def __str__(self):
            return '[%s]占地面积: %.2f' %(self.name,self.area)
    
    # bed = Furniture('bed',4)
    # print(bed)
    
    class House():
    
        def __init__(self,house_type,area):
            self.house_type = house_type
            self.area = area
            #剩余面积
            self.free_area = area
            self.item_list = []
    
        def __str__(self):
            return ('户型: %s\n总面积: %.2f[剩余面积: %.2f]\n家具: %s'
                    %(self.house_type,self.area,self.free_area,self.item_list))
    
        def add_item(self,item):
            #1.判断家具的面积
            if item.area > self.free_area:
                print('%s的面积太大，无法添加' %item.name)
                return False
            #2.添加家具
            self.item_list.append(item.name)
            #3.计算剩余面积
            self.free_area -= item.area
    
    bed = Furniture('bed',4)
    yigui = Furniture('yigui',200)
    table = Furniture('table',1.5)
    
    my_house = House('独门独栋',200)
    my_house.add_item(bed)
    my_house.add_item(yigui)
    my_house.add_item(table)
    print(my_house)

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 18]

4.利用面向对象实现栈

class Stack():
    
        def __init__(self):
            self.stack = []
    
        def push(self,value):
            self.stack.append(value)
            return True
    
        def pop(self):
            #判断栈是否为空
            if self.stack:
                item = self.stack.pop()
                return item
            else:
                return False
    
        def top(self):
            if self.stack:
                return self.stack[-1]
            else:
                return False
    
        def length(self):
            return len(self.stack)
    
        def view(self):
            return ','.join(self.stack)
    
    s = Stack()
    s.push('1')
    s.push('2')
    item = s.pop()
    print(s.view())

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg4OTYxNg_size_16_color_FFFFFF_t_70 19]

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