1.聲明一個(gè)電腦類: 屬性:品牌旦部、顏色祈搜、內(nèi)存大小 方法:打游戲较店、寫(xiě)代碼、看視頻

class Computer:
    def __init__(self, brand, color, memsize):
        self.brand = brand
        self.color = color
        self.memsize = memsize
# a.創(chuàng)建電腦類的對(duì)象容燕，然后通過(guò)對(duì)象點(diǎn)的?方式獲取梁呈、修改、添加和刪除它的屬性


c1 = Computer('apple', '銀色', '6G')
print(c1.brand)
c1.brand = '華碩'
print(c1.brand)
c1.screen_size = '15寸'
print(c1.screen_size)
del c1.color
# b.通過(guò)attr相關(guān)?方法去獲取蘸秘、修改官卡、添加和刪除它的屬性
c2 = Computer('apple', '銀色', '6G')
print(getattr(c2, 'brand'))
setattr(c2, 'color', '白色')
print(c2.color)
setattr(c2, 'screen_size', '16寸')
print(c2.screen_size)
delattr(c2, 'brand')

2.聲明一個(gè)人的類和狗的類:

狗的屬性:名字、顏色醋虏、年齡

狗的方法:叫喚

人的屬性:名字寻咒、年齡、狗

人的方法:遛狗

a.創(chuàng)建人的對(duì)象小明颈嚼，讓他擁有一條狗大黃毛秘，然后讓小明去遛大黃

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

    def dog_call(self):
        print('%s在叫喚' % self.name)


d1 = Dog('大黃', '黃色', '12')


class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age
        self.dog = None

    def walk_dog(self):
        if not self.dog:
            print('沒(méi)有狗')
        else:
            print('%s正在遛%s' % (self.name, self.dog.name))


p1 = Person('小明', '25')
print(d1.name)
p1.dog = d1  # 讓人擁有狗
print(p1.dog)
p1.walk_dog()

3.聲明一個(gè)圓類，自己確定有哪些屬性和方法

class Circle:
    pi = 3.14
    def __init__(self, radius):
        self.radius = radius

    def area(self):
        return Circle.pi*(self.radius**2)

    def perimeter(self):
        return 2*Circle.pi*self.radius


c1 = Circle(7)
print(c1.area())
print(c1.perimeter())

4.創(chuàng)建一個(gè)學(xué)生類:

屬性:姓名阻课，年齡熔脂，學(xué)號(hào)

方法:答到，展示學(xué)生信息

創(chuàng)建一個(gè)班級(jí)類:

屬性:學(xué)生柑肴，班級(jí)名

方法:添加學(xué)生霞揉，刪除學(xué)生，點(diǎn)名, 求班上學(xué)生的平均年齡

class Students:
    def __init__(self, name, age, stu_id):
        self.name = name
        self.age = age
        self.stu_id = stu_id
        self.is_in_class = random.randint(0, 1)
        
    def responses(self):
        print('%s, 到' % self.name)

    def show(self):
        print('學(xué)生：%s晰骑， 年齡：%s适秩， 學(xué)號(hào)：%s' % (self.name, self.age, self.stu_id))


class Class:
    def __init__(self, name):
        self.all_students = []
        self.name = name
        # self.count = 0

        def func():
            num = 1
            while True:
                yield 'stu'+str(num)
                num += 1
        self.create_id = func()
    def add_student(self):
        name = input('姓名：')
        age = input('年齡：')
        # self.count += 1
        # stu_id = 'stu'+str(self.count).rjust(3, '0')
        stu_id = self.create_id
        stu = Students(name, int(age), stu_id)
        self.all_students.append(stu)
        print('學(xué)生：%s， 年齡：%s硕舆， 學(xué)號(hào)：%s' % (name, age, stu_id))

    def show_all_students(self):
        for stu in self.all_students:
            stu.show()

    def delete(self):
        del_name = input('輸入要?jiǎng)h除學(xué)生姓名：')
        flag = False
        for stu in self.all_students[:]:
            if stu.name == del_name:
                stu.show()
                flag = True
                value = input('是否刪除（y/n）:')
                if value == 'y':
                    self.all_students.remove(stu)
                    print('刪除成功')
        if not flag:
            print('沒(méi)有該學(xué)生')

    def call_name(self):
        for stu in self.all_students:
            print(stu.name)
            if stu.is_in_class:
                stu.responses()

    def average(self):
        sum1 = 0
        for stu in self.all_students:
            sum1 += int(stu.age)
        print('python1903的平均年齡為%s' % (sum1/len(self.all_students)))


class1 = Class('python1903')
for i in range(3):
    class1.add_student()
class1.delete()
class1.call_name()
class1.average()class Students:
    def __init__(self, name, age, stu_id):
        self.name = name
        self.age = age
        self.stu_id = stu_id
        self.is_in_class = random.randint(0, 1)
        
    def responses(self):
        print('%s, 到' % self.name)

    def show(self):
        print('學(xué)生：%s秽荞， 年齡：%s， 學(xué)號(hào)：%s' % (self.name, self.age, self.stu_id))


class Class:
    def __init__(self, name):
        self.all_students = []
        self.name = name
        # self.count = 0

        def func():
            num = 1
            while True:
                yield 'stu'+str(num)
                num += 1
        self.create_id = func()
    def add_student(self):
        name = input('姓名：')
        age = input('年齡：')
        # self.count += 1
        # stu_id = 'stu'+str(self.count).rjust(3, '0')
        stu_id = self.create_id
        stu = Students(name, int(age), stu_id)
        self.all_students.append(stu)
        print('學(xué)生：%s抚官， 年齡：%s扬跋， 學(xué)號(hào)：%s' % (name, age, stu_id))

    def show_all_students(self):
        for stu in self.all_students:
            stu.show()

    def delete(self):
        del_name = input('輸入要?jiǎng)h除學(xué)生姓名：')
        flag = False
        for stu in self.all_students[:]:
            if stu.name == del_name:
                stu.show()
                flag = True
                value = input('是否刪除（y/n）:')
                if value == 'y':
                    self.all_students.remove(stu)
                    print('刪除成功')
        if not flag:
            print('沒(méi)有該學(xué)生')

    def call_name(self):
        for stu in self.all_students:
            print(stu.name)
            if stu.is_in_class:
                stu.responses()

    def average(self):
        sum1 = 0
        for stu in self.all_students:
            sum1 += int(stu.age)
        print('python1903的平均年齡為%s' % (sum1/len(self.all_students)))


class1 = Class('python1903')
for i in range(3):
    class1.add_student()
class1.delete()
class1.call_name()
class1.average()