Day14 作业

1.声明⼀个电脑类: 属性:品牌、颜⾊、内存⼤小 方法:打游戏、写代码、看视频
a.创建电脑类的对象，然后通过对象点的⽅方式获取、修改、添加和删除它的属性
b.通过attr相关⽅方法去获取、修改、添加和删除它的属性

"""______lxh______"""


class Computer:
    __slots__ = ('brand', 'color', 'memory', 'size')

    def __init__(self, brand, color, memory):
        self.brand = brand
        self.color = color
        self.memory = memory

    @staticmethod
    def p_game():
        print('打游戏!')

    @staticmethod
    def w_code():
        print('写代码!')

    @staticmethod
    def w_video():
        print('看视频!')


# .相关方法
computer1 = Computer('Lenovo', 'back', '512 GB')
print(computer1.brand, computer1.color, computer1.memory)       # Lenovo back 512 GB
computer1.color = 'red'     # 改
print(computer1.color)      # red
computer1.size = '16寸'      # 加
print(computer1.size)       # 16寸
del computer1.brand         # 删
# print(computer1.brand)  # AttributeError: brand

# b.attr相关⽅方法
computer2 = Computer('Huawei', 'gray', '1T')
print(getattr(computer2, 'brand'))      # 查
print(getattr(computer2, 'color'))
print(getattr(computer2, 'memory'))     # Huawei  gray  1T
setattr(computer2, 'brand', 'Lenovo')   # 改
print(getattr(computer2, 'brand'))      # Lenovo
delattr(computer2, 'memory')            # 删
print(getattr(computer2, 'memory', '0B'))       # 0B
setattr(computer2, 'size', '19寸')       # 加
print(getattr(computer2, 'size'))       # 19寸

2.声明⼀个人的类和狗的类:
狗的属性:名字、颜⾊色、年年龄
狗的⽅方法:叫唤
人的属性:名字、年年龄、狗
人的⽅方法:遛狗
a.创建⼈人的对象⼩小明，让他拥有⼀一条狗⼤大⻩黄，然后让⼩小明去遛⼤大⻩黄

class Dog:
    __slots__ = ('name', 'color', 'age')

    def __init__(self, name: str, color: str, age: int):
        self.name = name
        self.color = color
        self.age = age

    def bark(self):
        print('%s: 汪汪汪!' % self.name)


class Person:
    __slots__ = ('name', 'age', 'dog')

    def __init__(self, name: str, age=0, dog=None):
        self.name = name
        self.age = age
        self.dog = dog

    def walk_dog(self):
        if self.dog:
            print('%s遛%s' % (self.name, self.dog.name))
            dog1.bark()
        else:
            print('没狗!')


dog1 = Dog('大黄', 'yellow', 3)
person1 = Person('小明', 20, dog1)
person1.walk_dog()
# 小明遛大黄
# 大黄: 汪汪汪!

3.声明⼀一个圆类，自己确定有哪些属性和方法

from math import pi


class Circle:
    __slots__ = ('radius', 'girth', 'area')

    def __init__(self, radius):
        self.radius = radius

        self.area = pi * radius ** 2

    def c_girth(self):
        return 2 * pi * self.radius

    def c_area(self):
        return pi * self.radius ** 2


circle1 = Circle(5)
print(circle1.c_girth())    # 周长  31.41592653589793
print(circle1.c_area())     # 面积  78.53981633974483

4.创建⼀一个学⽣生类:
属性:姓名，年龄，学号
方法:答到，展示学⽣生信息

创建⼀一个班级类:
属性:学⽣生，班级名
方法:添加学⽣生，删除学生，点名, 求班上学生的平均年龄

class Student:
    __slots__ = ('name', 'age', 'sno', 'sex', 'class_n')

    def __init__(self, name=None, age=0, sno=None):
        self.name = name
        self.age = age
        self.sno = sno

    def replied(self):
        print('%s: 到!' % self.name)     # 答道

    def message(self):
        print(self.name, self.sno, self.age)    # 打印学生信息


class Class:
    __slots__ = ('stu', 'c_name')

    def __init__(self, c_name, *stu):
        self.stu = list(stu)
        self.c_name = c_name

    def add_stu(self, student):      # 添加学生
        self.stu.append(student)

    def del_stu(self, student):      # 删除学生
        self.stu.remove(student)

    def r_call(self):       # 点名
        for stu in self.stu:
            print(stu.name)

    def av_age(self):       # 平均年龄
        all_age = 0
        for age in self.stu:
            all_age += age.age
        print(all_age / len(self.stu))


def main():
    stu1 = Student('小明', age=19)
    py1904 = Class('py1904', stu1)
    stu2 = Student('小花', age=20)
    py1904.add_stu(stu2)
    py1904.r_call()     # 小明  小花
    py1904.av_age()     # 19.5


if __name__ == '__main__':
    main()