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相关方法去获取、修改、添加和删除它的属性
class Computer:
def __init__(self, color, brand, ram):
self.brand = brand
self.color = color
self.ram = ram
@staticmethod
def play_game(game):
print('打游戏:%s'%game)
def code(self):
print('用%s代码'% self.brand)
@staticmethod
def video(video):
print('看%s视频' % video)
对象.方法
computer1 = Computer('黑色', 'Mac', '8G')
# 获取
print(computer1.color, computer1.brand, computer1.ram)
# 修改
computer1.color = '白色'
# 添加
computer1.size = '20inch'
# 删除
del computer1.brand
print(computer1.color, computer1.size, computer1.ram)
attr相关方法
computer1 = Computer('黑色', 'Mac', '8G')
# 获取
print(getattr(computer1, 'color'))
# 修改
setattr(computer1, 'color', '白色')
# 添加
setattr(computer1, 'size', '20inch')
# 删除
print(computer1.color, computer1.size, computer1.ram)
2.声明⼀个人的类和狗的类:
狗的属性:名字、颜⾊色、年年龄
狗的方法:叫唤
人的属性:名字、年年龄、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, age, color):
self.name = name
self.age = age
self.color = color
def shout(self):
print('%s:汪汪'%self.name)
class Person:
def __init__(self, name, age, dog: Dog=None):
self.name = name
self.age = age
self.dog = dog
def walk_dog(self):
if self.dog:
print('%s在遛%s' % (self.name, self.dog.name))
else:
print('没有狗！')
def main():
dog1 = Dog('大黄', 2, '黄色')
person1 = Person('小明', 23, dog1)
person1.walk_dog()
3.声明一个圆类:
方法一：
class Circle:
pi = 3.14159265
def __init__(self, r, x=0, y=0):
self.r = r
self.x = x
self.y = y
def area(self):
return Circle.pi*self.r**2
def perimeter(self):
return Circle.pi*2*self.r
方法二：
class MyValueError(Exception):
def __str__(self):
return '当前属性不能复制！'
class Circle:
pi = 3.14159265
def __init__(self, r, x=0, y=0):
self.r = r
self.x = x
self.y = y
self._area = 0
self._perimeter = 0
@property
def area(self):
return Circle.pi*self.r**2
@area.setter
def area(self, value):
raise MyValueError
@property
def perimeter(self):
return Circle.pi*2*self.r
@perimeter.setter
def perimeter(self, value):
raise MyValueError
def main():
circle1 = Circle(5)
print(circle1.area)
# circle1.area = 2
print(circle1.perimeter)
4.创建一个学生类:
属性:姓名，年龄，学号
方法:答到，展示学生信息
创建一个班级类:
属性:学生，班级名
方法:添加学生，删除学生，点名, 求班上学生的平均年龄
class Student:
def __init__(self, name, age: int, number):
self.name = name
self.age = age
self.number = number
def here(self):
print('%s到！' % self.name)
def show_student_info(self):
print('姓名：%s 年龄：%d 学号：%s' % (self.name, self.age, self.number))
class ClassStudent:
def __init__(self, all_students : list, class_name):
self.all_students = all_students
self.class_name = class_name
def add_stu(self, student: Student):
self.all_students.append(student)
def del_stu(self, stu_number: str):
# self.all_students.pop(student)
for stu in all_students:
if stu.number == stu_number:
all_students.remove(stu)
return True
else:
return False
def call_name(self, name: str):
for stu in self.all_students:
if stu.name == name:
stu.here()
break
else:
print('%s不在。'% name)
def avg_age(self):
total = 0
for stu in self.all_students:
total += stu.age
return total/len(self.all_students)
def __repr__(self):
return str([(stu.name,stu.age) for stu in all_students])
stu1 = Student('ququ', 12, '001')
stu2 = Student('jojo', 22, '002')
stu3 = Student('popo', 32, '003')
all_students = [stu1, stu2]
py_class = ClassStudent(all_students, 'python1809')
py_class.add_stu(stu3)
print(py_class.avg_age())
py_class.call_name('ququ')
py_class.del_stu('003')
print(py_class)