1.聲明一個電腦類: 屬性:品牌、顏色、內(nèi)存大小 方法:打游戲、寫代碼、看視頻

class Pc:
    """電腦"""

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

    def game(self):
        pass

    def code(self):
        pass

    def video(self):
        pass

a.創(chuàng)建電腦類的對象，然后通過對象點的方式獲取、修改、添加和刪除它的屬性

p = Pc('Thunderobot', '銀色', '8g')  # 創(chuàng)建
print(p.colour)  # 查詢
p.colour = '黑色'  # 修改
p.weight = '5kg'  # 添加
del p.weight  # 添加

b.通過attr相關(guān)方法去獲取、修改、添加和刪除它的屬性

print(getattr(p, 'colour'))  # 查詢
setattr(p, 'colour', '銀色')  # 修改
setattr(p, 'weight', '5kg')  # 添加
del p.weight  # 刪除

2.聲明一個人的類和狗的類:

狗的屬性:名字、顏色、年齡

狗的方法:叫喚

class Dog:
    """狗"""
    def __init__(self, name='unknow', colour='unknow', age='unknow'):
        self.dog_name = name
        self.dog_colour = colour
        self.dog_age = age

    def barking(self):
        print(self.dog_name, '：“汪汪汪！”')
        return

人的屬性:名字、年齡、狗

人的方法:遛狗

class Person(Dog):
    """人"""
    def __init__(self, name, age, dog_name='unknow', dog_colour='unknow', dog_age='unknow'):
        Dog.__init__(self, dog_name, dog_colour, dog_age)
        self.name = name
        self.age = age

    def walk_dog(self):
        print('%s出門溜%s' % (self.name, self.dog_name))

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

person = Person('小明', '20', '大黃')
person.walk_dog()

3.聲明一個圓類，自己確定有哪些屬性和方法

import math
class Round:
    def __init__(self, radius: float):
        self.radius = radius

    def area(self):
        return self.radius * self.radius * math.pi

    def girth(self):
        return 2 * math.pi * self.radius

4.創(chuàng)建一個學(xué)生類:

屬性:姓名，年齡，學(xué)號

方法:答到，展示學(xué)生信息

student = [{'姓名': '小明', '年齡': 18, '學(xué)號': '1'}]
class Student:
    def __init__(self, name, age):
        self.stu_name = name
        self.stu_age = age
        self.stu_id = str(len(students) + 1)
        students.append({'姓名': name, '年齡': age, '學(xué)號': self.stu_id})

    def say_yes(self):
        print(self.stu_name, '：“到！”')

    def ex_stu(self):
        print(self.stu_name, self.stu_age, self.stu_id)

創(chuàng)建一個班級類:

屬性:學(xué)生，班級名

方法:添加學(xué)生，刪除學(xué)生，點名, 求班上學(xué)生的平均年齡

students = [{'姓名': '小明', '年齡': 18, '學(xué)號': '1'}]
class Classes:

    def __init__(self, class_name):
        self.class_name = class_name
        self.students = students

    def add_stu(self, stu_name, stu_age: int):
        student = {'姓名': stu_name, '年齡': stu_age, '學(xué)號': str(len(students) + 1)}
        students.append(student)
        print('添加成功')

    def del_stu(self, stu_name='', stu_id=''):
        for stu_dic in students:
            if stu_name == stu_dic['姓名'] or stu_id == stu_dic['學(xué)號']:
                students.remove(stu_dic)
                print('刪除成功')

    def say_yes(self, stu_name='', stu_id=''):
        for stu_dic in students:
            if stu_name == stu_dic['姓名'] or stu_id == stu_dic['學(xué)號']:
                print('Yes!')

    def ave_age(self):
        ages = 0
        for stu_dic in students:
            ages += stu_dic['年齡']
        return ages / len(students)