"""------ author == 李 墨 ------"""

import math
import random
random.seed(0)

1

class Computer:
    def __init__(self,brand='thinkpad',color='black',memory='8G'):
        self.brand=brand
        self.color=color
        self.memory=memory
    def play_game(self):
        print('打游戲')
    def coding(self):
        print('寫(xiě)代碼')
    def watch_TV(self):
        print('看視頻')

a

cp1=Computer()
print(cp1.color)
cp1.memory='16G'
print(cp1.memory)
cp1.weight='2kg'
print(cp1.__dict__)
del cp1.color
print(cp1.__dict__)
# print(cp1.color)AttributeError: 'Computer' object has no attribute 'color'

b

cp2=Computer()
print(getattr(cp2,'color'))
setattr(cp2,'memory','16G')
print(cp2.memory)
setattr(cp2,'weight','2kg')
print(cp2.weight)
delattr(cp2,'color')
print(cp2.__dict__)

2

class Dog:
    def __init__(self,name,color,age):
        self.name=name
        self.color=color
        self.age=age
    def bark(self):
        print('%s快過(guò)來(lái)丛楚！')
dog1=Dog('大黃','yellow',2)

class Human:
    def __init__(self,name,age):
        self.name=name
        self.age=age
    def walk_a_dog(self,dog1):
        print('%s遛%s'%(self.name,dog1.name))

a

hm1=Human('小明','18')
hm1.walk_a_dog(dog1)

3

class Circular:
    def __init__(self,radius):
        self.radius=radius
    def girth(self):#周長(zhǎng)
        return 2*math.pi*self.radius
    def measure(self):
        return math.pi*(self.radius**2)
c1=Circular(10)
print(c1.girth(),c1.measure())

4

class Student:
    def __init__(self,name,age,stuid):
        self.name=name
        self.age=age
        self.stuid=stuid
        self.exist=random.randint(0,1)
    def answer(self):
        if self.exist:
            print('%s到'%self.name)
        else:
            print('%s未到'%self.name)
    def showStuData(self):
        print('學(xué)生：%s,年齡：%s,學(xué)號(hào)：%s,是否上課：%s'%(self.name,self.age,self.stuid,self.exist))
        # return {'姓名':self.name,'學(xué)號(hào)':self.stuid,'年齡':self.age}
allid=(str(i).zfill(3) for i in range(1,50))
allname=(chr(i) for i in range(ord('a'),ord('z')))
all_stu=[]
for i in range(20):#20個(gè)學(xué)生
    stu=Student(next(allname),random.randint(14,24),next(allid))
    stu.answer()
    stu.showStuData()
    all_stu.append(stu)

print('==============分割線================')

class ClassData:
    def __init__(self,className='py1902',stu_data=[]):
        self.stu=stu_data
        self.name=className
    def addStu(self,stu1):
        self.stu.append(stu1)
    def delStu(self,name1):
        self.stu=list(item for item in self.stu if item.name!=name1)
    def callStu(self):
        for item in self.stu:
            if item.exist:
                print('%s到;'%item.name,end='')
            else:
                print('%s未到;'%item.name,end='')
        print()
    def aveAge(self):
        list_age=list(iter.age for iter in self.stu)
        return sum(list_age) / len(list_age)
class1=ClassData(stu_data=all_stu)
stu_add=Student('添加者',18,next(allid))
class1.addStu(stu_add)
class1.delStu('b')
class1.callStu()
print('平均年齡：',class1.aveAge())