day13-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 class Computer: def __init__(self, brand='', color='', memory=''): self.brand = brand self.color = color self.memory = memory @classmethod def play_game(cls): print('打游戏') @classmethod def write_code(cls): print('写代码') @classmethod def watch_video(cls): print('看视频') c1 = Computer() 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 # 获取 print(c1.brand) # 添加 c1.brand = '华硕' c1.color = '黑色' c1.memory = '8G' # 修改 c1.brand = '苹果' # 删除 del c1.brand b.通过attr相关⽅方法去获取、修改、添加和删除它的属性 # 获取 print(getattr(c1, 'brand', '外星人')) # 添加 setattr(c1, 'brand', '华硕') setattr(c1, 'brand', '黑色') setattr(c1, 'brand', '8G') # 修改 setattr(c1, 'brand', '华硕') # 删除 delattr(c1, 'color') 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: def __init__(self, name='', age=0, color=''): self.name = name self.age = age self.color = color @classmethod def shout(cls): print('汪汪汪...') class Person: def __init__(self, name, age, dog=None): self.name = name self.age = age self.dog = dog def walk_dog(self): print('%s在遛%s' % (self.name, self.dog.name)) d1 = Dog('大黄', 3, '黄色') p1 = Person('小明', 18, d1) p1.walk_dog() 运行： image.png 3.声明⼀一个圆类: class Circle: def __init__(self, radius): self.radius = radius def area(self): import math area = (math.pi * self.radius ** 2) return '面积是%.2f' % area def peri(self): import math peri = 2 * math.pi * self.radius return '周长是%.2f' % peri c1 = Circle(5) print(c1.area(), c1.peri()) 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 def open_read_files(): with open('Pweson.json') as f: content = f.read() return content def open_write_diles(content): with open('Person.json', 'w', encoding='utf-8') as f: f.write(content) class Student: def __init__(self, name, age, num): self.name = name self.age = age self.num = num @classmethod def answer(cls, name2): import json content = json.loads(open_read_files()) for x in content: if name2 in x['name']: print('到！') return x class Class1: def __init__(self, *stu, classname): self.stu = stu self.classname = classname @classmethod def add_stu(cls, s): import json content = json.loads(open_read_files()) if not content: s = s.__dict__ content.append(s) content = json.dumps(content) open_write_diles(content) content = json.loads(open_read_files()) print(content) print('添加成功！') else: for x in content: if s.num not in x and content.index(x) == -1: s = s.__dict__ content.append(s) content = json.dumps(content) open_write_diles(content) content = json.loads(open_read_files()) print(content) print('添加成功！') else: print('账号已存在！') @classmethod def del_stu(cls, s): import json content = json.loads(open_read_files()) if not content: print('无任何学生信息！') else: for x in content: if s.num1 in x: content.remove(x) open_write_diles(content) print('删除成功！') else: print('账号不存在!') @classmethod def call_the_roll(cls, name1): print('%s' % name1) s = Student() s.answer(name1) @classmethod def average(cls): import json content = json.loads(open_read_files()) sum_age = 0 for x in content: sum_age += x['age'] return '平均年龄是%.2f' % sum_age