math <span style="color: #0000ff">class<span style="color: #000000"> Circle:
<span style="color: #800000">'''<span style="color: #800000">
定义了一个圆形类;
提供计算面积(area)和周长(perimeter)的方法
<span style="color: #800000">'''
<span style="color: #0000ff">def <span style="color: #800080">
init<span style="color: #000000">(self,radius):
self.radius =<span style="color: #000000"> radius
</span><span style="color: #0000ff">def</span><span style="color: #000000"> area(self):
</span><span style="color: #0000ff">return</span> pi * self.radius *<span style="color: #000000"> self.radius
</span><span style="color: #0000ff">def</span><span style="color: #000000"> perimeter(self):
</span><span style="color: #0000ff">return</span> 2 * pi *<span style="color: #000000">self.radius
circle = Circle(10) <span style="color: #008000">#<span style="color: #008000">实例化一个圆
area1 = circle.area() <span style="color: #008000">#<span style="color: #008000">计算圆面积
per1 = circle.perimeter() <span style="color: #008000">#<span style="color: #008000">计算圆周长
<span style="color: #0000ff">print(area1,per1) <span style="color: #008000">#<span style="color: #008000">打印圆面积和周长
<span style="color: #0000ff">class<span style="color: #000000"> Ring:
<span style="color: #800000">'''<span style="color: #800000">
定义了一个圆环类
提供圆环的面积和周长的方法
<span style="color: #800000">'''
<span style="color: #0000ff">def <span style="color: #800080">init<span style="color: #000000">(self,radius_outside,radius_inside):
self.outsid_circle =<span style="color: #000000"> Circle(radius_outside)
self.inside_circle =<span style="color: #000000"> Circle(radius_inside)
</span><span style="color: #0000ff">def</span><span style="color: #000000"> area(self):
</span><span style="color: #0000ff">return</span> self.outsid_circle.area() -<span style="color: #000000"> self.inside_circle.area()
</span><span style="color: #0000ff">def</span><span style="color: #000000"> perimeter(self):
</span><span style="color: #0000ff">return</span> self.outsid_circle.perimeter() +<span style="color: #000000"> self.inside_circle.perimeter()
ring = Ring(10,5) <span style="color: #008000">#<span style="color: #008000">实例化一个环形
<span style="color: #0000ff">print(ring.perimeter()) <span style="color: #008000">#<span style="color: #008000">计算环形的周长
<span style="color: #0000ff">print(ring.area()) <span style="color: #008000">#<span style="color: #008000">计算环形的面积
===<span style="color: #0000ff">class<span style="color: #000000"> Course:
<span style="color: #0000ff">def <span style="color: #800080">init<span style="color: #000000">(self,price):
self.name =<span style="color: #000000"> course_name
self.period =<span style="color: #000000"> period
self.price =<span style="color: #000000"> price
<span style="color: #0000ff">class<span style="color: #000000"> Teacher:
<span style="color: #0000ff">def <span style="color: #800080">init<span style="color: #000000">(self,name,age,sex,birthday):
self.name =<span style="color: #000000"> name
self.age =<span style="color: #000000"> age
self.sex =<span style="color: #000000"> sex
self.birthday =<span style="color: #000000">birthday
self.course = Course(<span style="color: #800000">'<span style="color: #800000">python<span style="color: #800000">',<span style="color: #800000">'<span style="color: #800000">6 month<span style="color: #800000">',2000<span style="color: #000000">)
b = Birthday(2018,1,16<span style="color: #000000">)
egg = Teacher(<span style="color: #800000">'<span style="color: #800000">egon<span style="color: #800000">',<span style="color: #800000">'<span style="color: #800000">女<span style="color: #800000">'<span style="color: #000000">,b)
<span style="color: #0000ff">print<span style="color: #000000">(egg.name)
<span style="color: #0000ff">print<span style="color: #000000">(egg.birthday.year)
<span style="color: #0000ff">print<span style="color: #000000">(egg.birthday.month)
<span style="color: #0000ff">print(egg.course.price)