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式获取、修改、添加和删除它的属性
b.通过attr相关方法去获取、修改、添加和删除它的属性
class Computer:
def __init__(self,brand,color,memory):
self.brand = brand
self.color = color
self.memory = memory
def play_game(self):
print('play games')
def write_codes(self):
print('write codes')
def look_video(self):
print('look at video')
if __name__ == '__main__':
computer = Computer('HP','white','2g')
computer.play_game()
print(computer.brand,computer.color,computer.memory)
computer.brand = 'Apple'#修改
computer.type = 'PC'#添加
del computer.color #删除
print(computer.brand, computer.type, computer.memory) #查看
setattr(computer,'brand','华硕') #修改
delattr(computer,'memory') #删除
print(getattr(computer,'brand'),getattr(computer,'color','Black'),computer.__getattribute__('type')) #查看和添加
result:
play games
HP white 2g
Apple PC 2g
华硕 Black PC
2.声明一个人的类和狗的类：
狗的属性：名字、颜色、年龄 狗的方法：叫唤
人的属性：名字、年龄、狗
人的方法：遛狗
a.创建人的对象小明，让他拥有一条狗大黄，然后让小明去遛大黄
class Dog:
def __init__(self,name,color,age):
self.color = color
self.name = name
self.age = age
def voice(self):
return(self.name+'-汪汪汪')
class Person:
def __init__(self,name,age,dog):
self.name = name
self.age = age
self.dog = dog
def walk_dog(self,voice):
print(self.name + '->遛狗->'+self.dog+'叫唤->'+voice)
if __name__ == '__main__':
dog = Dog('大黄','粉色','3')
person = Person('小明','10',dog.name)
person.walk_dog(dog.voice())
result:
小明->遛狗->大黄叫唤->大黄-汪汪汪
声明一个矩形类：属性：长、宽 ⽅方法：计算周长和面积
a.创建不同的矩形，并且打印其周长和面积
class Rectangle:
def __init__(self,length,width):
self.length = length
self.width = width
def circumference(self):
return '周长:%.2f' % 2*(self.length+self.width)
def area(self):
return '面积:%.2f' % 2*self.length*self.width
创建一个学生类：属性：姓名，年龄，学号 ⽅方法：答到，展示学生信息
创建一个班级类：属性：学生，班级名 ⽅方法：添加学生，删除学生，点名
class Student:
def __init__(self,name,age,id):
self.name = name
self.age = age
self.id = id
def sign_in(self):
print(self.name+'已到达')
def show_student(self):
print( {'name':self.name,'age':self.age,'id':self.id})
class Class:
def __init__(self,class_name,students):
self.class_name = class_name
self.students = students
def add_student(self,student):
"""
添加学生到学生列表中
:param student: 学生信息的字典
:return:
"""
self.students.apppend(student)
print('添加学生成功.')
def del_student(self,student_name):
"""
传入学生的姓名后从学生列表中删除该学生
:param student_name:
:return:
"""
for stu in self.students[:]:
if student_name == stu['name']:
self.students.remove(stu)
print('删除成功')
break
print('删除失败.')
def call_name(self):
for stu in self.students:
print(stu['name'],end=' ')
5.写一个类，封装所有和数学运算相关的功能（包含常用功能和常用值，例例如：pi, e等）
class Maths:
pi = 3.141592653589793
e = 2.718281828459045
@classmethod
def addition(cls,*number):
"""
加法
:param number:远算数元组
:return:
"""
return(sum(number))
@classmethod
def subtraction(cls,num,*number):
"""
减法
:param num:减数
:param number:被减数元组
:return:
"""
return(num-sum(number))
@classmethod
def multiplication(cls,*number):
"""
乘法
:param number: 乘数元组
:return:
"""
count = 1
for item in number:
count *= item
return count
@classmethod
def division(cls,num,*number):
"""
除法
:param num:除数
:param number:被除数元组
:return:
"""
for item in number:
num /= item
return num
@classmethod
def exponentiation(cls, number,num):
"""
乘方
:param number: 底数
:param num: 阶数
:return:
"""
count = 1
if num > 0:
for _ in range(num):
count *= number
return count
@classmethod
def factorial(cls, number,num):
"""
阶乘
:param number: 底数
:param num:阶数
:return:
"""
count = 1
if not num:
return 1
if num > 0:
for n in range(1,num+1):
count *= n
return count
6.1.写一个班级类，属性：班级名、学生； 功能：添加学生、删除学生、根据姓名查看学生信息，展示班级的所有学生信息
class Class2:
def __init__(self,class_name,students):
self.class_name = class_name
self.students = students
def add_student(self,student):
"""
添加学生到学生列表中
:param student: 学生信息的字典
:return:
"""
self.students.apppend(student)
print('添加学生成功.')
def del_student(self,student_name):
"""
传入学生的姓名后从学生列表中删除该学生
:param student_name:
:return:
"""
for stu in self.students[:]:
if student_name == stu['name']:
self.students.remove(stu)
print('删除成功')
break
print('删除失败.')
def query_student(self,student_name):
for stu in self.students:
if student_name == stu['name']:
print('找到该学生:%s' % stu)
break
print('没有找到该学生')
def all_students(self):
for stu in self.students:
print(stu)