day16-面向对象作业

1. 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, length0, width0):
           self.length = length0
           self.width = width0
   
       def area(self):
           print(f'面积：{self.length * self.width}')
   
       def perimeter(self):
           print(f'周长：{(self.length + self.width) * 2}')
   
   
   r1 = Rectangle(10, 20)
   r1.area()
   r1.perimeter()
   

2. 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, x1, y1):
           self.x = x1
           self.y = y1
   
       def distance(self, p2):
           return f'两个点之间的距离：{((self.y - p2.y) ** 2 + (self.x - p2.x) ** 2) ** 0.5}'
   
   
   p1 = Point(3, 4)
   p2 = Point(3, 0)
   print(p1.distance(p2))
   

3. 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

   # 和第二题一起看（因为在第二题中已经有定义点的类Point和算距离的方法了）；类中有类；
   
   class Circle:
       pi = 3.1415926
   
       def __init__(self, r, center: Point):
           self.radius = r
           self.center = center
   
       def perimeter(self):
           print(f'圆的周长：{2 * Circle.pi * self.radius}')
   
       def area(self):
           print(f'圆的面积：{Circle.pi * self.radius ** 2}')
   
       def if_tangent(self, c2):
           if self.radius + c2.radius == self.center.distance(c2.center):
               print('两圆外切')
           else:
               print('两圆不外切')
   
   
   c1 = Circle(3, Point(0, 5))
   c2 = Circle(4, Point(5, 6))
   c1.perimeter()
   c1.area()
   c1.if_tangent(c2)
   

4. 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

   # 和第二题一起看,已经有Point类了
   class Line:
       def __init__(self, start: Point, end: Point):
           self.start = start
           self.end = end
   
       def length(self):
           return self.start.distance(self.end)
   

5. 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: str, sex: str, kind: str):
           self.name = name
           self.sex = sex
           self.kind = kind
   
       def dog1(self):
           print(f'{self.name}叫唤')
   
   
   class Person:
       def __init__(self, name: str, age: int, dog: Dog):
           self.name = name
           self.age = age
           self.dog = dog
   
       def play(self):
           print(f'{self.name}溜{self.dog.kind}品种的{self.dog.name}')
   
   
   d1 = Dog('馒头', '公狗', '比熊')
   p1 = Person('王纯', 18, d1)
   d1.dog1()
   p1.play()