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
class Computer:
    """电脑类"""

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

    def play_game(self):
        print('打游戏')

    def write_code(self):
        print('写代码')

    def look_tv(self):
        print('看视频')


def point_to_obtain():
    """对象点的方式获取"""
    c1 = Computer('联想', '黑色', '20T')
    # 查
    print(c1.brand)  # 联想
    # 修改
    c1.memory = '100t'
    print(c1.memory)  # 100t
    # 增加
    c1.display = '200*200'
    print(c1.display)  # 200*200
    # 删除
    del c1.color
    # print(c1.color) AttributeError: 'Computer' object has no attribute 'color'


def attr_obtain():
    c2 = Computer('战神', '白色', '2t')
    # 查
    print(getattr(c2, 'brand'))  # 战神
    # 改
    setattr(c2, 'color', '红色')
    print(c2.color)  # 红色
    # 增
    setattr(c2,'display','800*800')
    print(c2.display) # 800*800
    # 删
    delattr(c2,'color')
    # print(c2.color)        AttributeError: 'Computer' object has no attribute 'color'

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2.声明⼀个人的类和狗的类:

# 狗的属性:名字、颜⾊、年龄
# 狗的⽅方法:叫唤
# 人的属性:名字、年龄、狗
# 人的⽅方法:遛狗
# a.创建⼈的对象小明，让他拥有⼀条狗⼤大⻩黄，然后让小明去遛⼤⻩
class Person:
    """人的类"""

    def __init__(self, name, age, dog):
        self.name = name
        self.age = age
        self.dog = dog

    def walk_the_dog(self):
        print('%s遛狗' % self.name)


class Dog:
    """狗的类"""

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

    def cry_out(self):
        print('%s叫唤' % self.name)


def self_person():
    p1 = Person('憨猜猜', 20, '大黄')
    p1.walk_the_dog()  # 憨猜猜遛狗

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3.声明⼀一个圆类:

class Circle:
    """圆类"""

    def __init__(self, r, ):
        self.r = r
        self.c = 3.14

    def circular_area(self):
        area = self.c * self.r ** 2
        print('圆的面积是%s' % area)

    def circumference(self):
        circum = 2*self.c*self.r
        print('圆的周长是%s'%circum)


c1 = Circle(5)
print(c1.circular_area())  # 圆的面积是78.5

print(c1.circumference())  # 圆的周长是31.400000000000002

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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，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:
    """学生类"""

    def __init__(self, name, age, stu):
        self.name = name
        self.age = age
        self.stu = stu

    def answer_to_the(self):
        """答到"""
        # return self.__dict__
        print(self.__dict__)
        # print('%s到，%s %s %s' % (self.name, self.stu, self.name, self.age))


# s1 = Student('憨猜猜', 21, 'stu10001')


class ClassAndGrade:
    """班级类"""

    # number = []

    def __init__(self, list1, classname='python1809'):
        # self.student = student
        self.list1 = list1
        self.classname = classname

    def all_student(self, student):
        """添加学生"""
        self.list1.append(student)
        # return self.list1
        print(self.list1)

    def del_student(self, student):
        """删除学生"""
        self.list1.remove(student)
        # return self.list1
        print(self.list1)

    def call_the_roll(self):
        """点名"""
        for dict1 in self.list1:
            print(dict1['name'])

    def mean_age(self):
        sum_age = 0
        index = 0
        for dict1 in self.list1:
            index += 1
            sum_age += dict1['age']
        # return sum_age / index
        print(sum_age/index)


def main():
    s1 = Student('憨猜猜', 21, 'stu10001')
    s1.answer_to_the()  # 憨猜猜到，stu10001 憨猜猜 21

    c1 = ClassAndGrade([{'name': '憨猜猜', 'age': 21, 'tel': 123456}])
    c1.all_student({'name': '小明', 'age': 20, 'tel': 12345})
    c1.del_student({'name': '憨猜猜', 'age': 21, 'tel': 123456})
    c1.all_student({'name': '星系', 'age': 23, 'tel': 123456})
    c1.all_student({'name': '拉拉', 'age': 30, 'tel': 123456})
    c1.all_student({'name': '傻逼', 'age': 28, 'tel': 123456})
    c1.all_student({'name': '网红', 'age': 50, 'tel': 123456})
    c1.call_the_roll()
    c1.mean_age()
    # print(c1)