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方式获取、修改、添加和删除它的属性
b.通过attr相关⽅方法去获取、修改、添加和删除它的属性
class Computer:
def __init__(self, brand, color, memsize):
self.brand = brand
self.color = color
self.memsize = memsize
@staticmethod
def play_game():
print('打游戏')
@staticmethod
def write_code():
print('写代码')
@staticmethod
def watch_tv():
print('看视频')
computer = Computer('华硕', '银', 15)
# 获取
print(computer.brand, computer.color, computer.memsize) # 华硕 银 15
print(getattr(computer, 'brand'), getattr(computer, 'color'), getattr(computer, 'memsize')) # 华硕 银 15
# 修改
computer.memsize = 12
computer.brand = '华为'
computer.color = '红'
print(computer.brand, computer.color, computer.memsize) # 华为 红 12
setattr(computer, 'brand', '戴尔')
setattr(computer, 'color', '灰')
setattr(computer, 'memsize', 14)
print(computer.brand, computer.color, computer.memsize) # 戴尔 灰 14
# 添加
computer.cpu = 'i78400'
print(computer.cpu) # i78400
setattr(computer, 'xianka', 'GTX960')
print(computer.xianka) # GTX960
# 删除
del computer.cpu
delattr(computer, 'xianka')
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.name = name
self.color = color
self.age = age
def call(self):
print('%s在叫唤' % self.name)
class Person:
def __init__(self, name, age, dog=None):
self.name = name
self.age = age
self.dog = dog
def walk_the_dog(self):
if self.dog:
print("%s遛%s" % (self.name, self.dog.name))
else:
print('没有狗')
person = Person('小明', 15)
person.dog = Dog('大黄', '黄色', 2)
person.walk_the_dog() # 小明遛大黄
3.声明⼀一个圆类，自己确定有哪些属性和方法
class Point:
def __init__(self, x, y):
self.x = x
self.y = y
def distance(self, other):
"""
求当前点到另外一个点的距离
:param other: 另外一给点对象
:return: 两个点之间的距离
"""
a = self.x - other.x
b = self.y - other.y
return (a ** 2 + b ** 2) ** 0.5
class Circle:
pi = 3.14
def __init__(self, radius, center: Point):
self.radius = radius
self.center = center
def area(self):
print("圆的面积是%.2f" % (Circle.pi * self.radius ** 2))
def perimeter(self):
print("圆的周长是%.2f" % (2 * Circle.pi * self.radius))
def circles_center_distance(self, other):
"""
求两圆的圆心
:param other:另外一个圆
:return: 圆心距
"""
return self.center.distance(other.center)
class Line:
def __init__(self, start_point: Point, end_point: Point):
self.start_point = start_point
self.end_point = end_point
def length(self):
return self.start_point.distance(self.end_point)
line1 = Line(Point(100, 0), Point(0, 0))
print(line1.length())
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
class Student:
def __init__(self, name, age, stu_id):
self.name = name
self.age = age
self.stu_id = stu_id
self.is_in_classroom = randint(0, 1)
def replied(self):
if self.is_in_classroom:
print('%s到' % self.name)
else:
print('不在')
def stu_info(self):
print('姓名：{}, 年级：{}, 学号{}'.format(self.name, self.age, self.stu_id))
class Class:
def __init__(self, class_name):
self.students = []
self.class_name = class_name
def add_stu(self):
stu_name = input("请输入学生姓名：")
stu_age = int(input("请输入学生年龄："))
stu_id = input("请输入学生学号：")
new_stu = Student(stu_name, stu_age, stu_id)
self.students.append(new_stu)
def del_stu(self):
stu_id = input("请输入学生学号：")
for stu in self.students[:]:
if stu.stu_id == stu_id:
self.students.remove(stu)
break
else:
print('没有该学生')
def call(self):
for stu in self.students:
print(stu.name)
stu.replied()
def average_age(self):
count = len(self.students)
sum1 = 0
for stu in self.students:
sum1 += stu.age
ave_age = sum1 / count
print(ave_age)
# 让班级所有学生按年龄从小到大排序
def sort_age(self):
self.students.sort(key=lambda stu: stu.age)
def show(self):
for stu in self.students:
stu.stu_info()
stu = Student('李四', 15, '123')
cl = Class('12班')
# print('添加学生')
# while 1:
# cl.add_stu()
# i = input('是否继续(1继续,任意键退出)：')
# if i != '1':
# break
# print('删除学生：')
#
# cl.del_stu()
# print('点名')
# cl.call()
# print('平均年龄：')
for _ in range(5):
cl.add_stu()
# cl.average_age()
cl.sort_age()
cl.show()
