day15-面向对象作业

1. 定义一个狗类和一个人类：

   狗拥有属性：姓名、性别和品种 拥有方法：叫唤

   人类拥有属性：姓名、年龄、狗 拥有方法：遛狗

   class Dog:
       def __init__(self, name, sex, breed):
           self.name = name
           self.sex = sex
           self.breed = breed
   
       def call_out(self):
           """模拟小狗叫唤"""
           print(f'{self.name}:汪汪汪')
   
   
   d1 = Dog(name='旺财', sex='公的', breed='柴犬')
   print(d1.call_out())
   
   
   class Person:
       def __init__(self, name, age=18, dog=None):
           self.name = name
           self.age = age
           self.dog = dog
   
       def walk_dog(self):
           """遛狗"""
           if self.dog:
               print(f'{self.name}牵着{self.dog.name}散步')
           else:
               print('目前没有狗可以遛')
   
   
   p1 = Person('小明')
   p1.dog = Dog('旺财', '公', '柴犬')
   print(p1.walk_dog())
   
   

2. 定义一个矩形类，拥有属性：长、宽 拥有方法：求周长、求面积

   class Rectangle:
       def __init__(self, long, wide):
           self.long = long
           self.wide = wide
   
       def girth(self):
           """矩形的周长"""
           return (self.long + self.wide) * 2
   
       def area(self):
           """矩形的面积"""
           return self.long * self.wide
   
   
   r1 = Rectangle(long=5, wide=3)
   print(f'周长:{r1.girth()},面积:{r1.area()}')
   

3. 定义一个二维点类，拥有属性：x坐标、y坐标 拥有方法：求当前点到另外一个点的距离

   class Point:
       def __init__(self, x=0, y=0):
           self.x = x
           self.y = y
   
       def distance(self, other):
           """求点1到原点的距离"""
           return ((self.x - other.x) ** 2 + (self.y - other.y) ** 2) ** 0.5
   
   
   p1 = Point(10, 0)
   p2 = Point()
   print(p1.distance(p2))
   
   

4. 定义一个圆类，拥有属性：半径、圆心 拥有方法：求圆的周长和面积、判断当前圆和另一个圆是否外切

   class Circle:
       pi = 3.14
   
       def __init__(self, r, center: Point):
           self.r = r
           self.center = center
   
       def girth(self):
           """圆的周长"""
           return Circle.pi * self.r * 2
   
       def area(self):
           """圆的面积"""
           return Circle.pi * self.r ** 2
   
       def is_exterior_contact(self,other):
           return self.center.distance(other.center) == self.r + other.r
   
   
   c1 = Circle(10, Point())
   c2 = Circle(10, Point(20,0))
   print(c1.is_exterior_contact(c2))
   
   

5. 定义一个线段类，拥有属性：起点和终点， 拥有方法：获取线段的长度

   class Line:
       def __init__(self, start: Point, end: Point):
           self.start = start
           self.end = end
   
       def length(self):
           """线段的长度"""
           return self.start.distance(self.end)
   
   
   l1 = Line(Point(), Point(40, 30))
   print(l1.length())
   

6. 写一个斗地主游戏类（根据生活经验添加类的内容）