from math import pi

"""
1.建立一個(gè)汽車類Auto，包括輪胎個(gè)數(shù)，汽車顏色，車身重量，速度等屬性，
并通過(guò)不同的構(gòu)造方法創(chuàng)建實(shí)例。至少要求 汽車能夠加速 減速 停車。

再定義一個(gè)小汽車類CarAuto 繼承Auto 并添加空調(diào)、CD屬性，
并且重新實(shí)現(xiàn)方法覆蓋加速、減速的方法
"""

class Auto:
    def __init__(self, color='白色', weight=50, speed=0):
        # color='紅色', weight=100, speed=10
        self.tyre_count = 4
        self.color = color
        self.weight = weight
        self.speed = speed
        self.__max_speed = 300

    def speed_up(self, value):
        """加速"""
        new_speed = self.speed + value
        if new_speed > self.__max_speed:
            self.speed = self.__max_speed
        else:
            self.speed = new_speed

    def speed_down(self, value):
        """減速"""
        new_speed = self.speed - value
        if new_speed < 0:
            self.speed = 0
        else:
            self.speed = new_speed

    def stop(self):
        """停車"""
        self.speed = 0


class CarAuto(Auto):
    def __init__(self, color='', weight=100, speed=10):
        # color='紅色', weight=100, speed=10
        super().__init__(color, weight, speed)  # super().__init__('紅色', 100, 10)

        self.CD = ''
        self.air_conditioner = '格力'


c1 = CarAuto('紅色')
print(c1.__dict__)

"""
3.創(chuàng)建一個(gè)動(dòng)物類，擁有屬性：性別、年齡、顏色、類型 ，
要求打印這個(gè)類的對(duì)象的時(shí)候以'/XXX的對(duì)象: 性別-? 年齡-? 顏色-? 類型-?/' 的形式來(lái)打印
"""
print('===================第三題===================')

class Animal:
def init(self, gender='公', age=1, color='黑色', type='爬行'):
self.gender = gender
self.age = age
self.color = color
self.type = type

def __repr__(self):
    return '/%s的對(duì)象: 性別-%s 年齡-%d 顏色-%s 類型-%s/' % \
           (self.__class__.__name__, self.gender, self.age, self.color, self.type)

class Dog(Animal):
pass

an1 = Animal()
print(an1)

dog1 = Dog()
print(dog1)

"""
4.寫(xiě)一個(gè)圓類， 擁有屬性半徑、面積和周長(zhǎng)；要求獲取面積和周長(zhǎng)的時(shí)候的時(shí)候可以根據(jù)半徑的值把對(duì)應(yīng)的值取到。
但是給面積和周長(zhǎng)賦值的時(shí)候，程序直接崩潰，并且提示改屬性不能賦值
"""
print('===================第三題===================')

class ReadOnlyError(Exception):
def str(self):
return 'Modify the read-only property'

class Circle:
def init(self, r):
self.r = r
self._perimeter = 0
self._area = 0

# perimeter
@property
def perimeter(self):
    return self.r*pi*2

@perimeter.setter
def perimeter(self, value):
    raise ReadOnlyError

# area
@property
def area(self):
    return pi*self.r**2

@area.setter
def area(self, value):
    raise ReadOnlyError

c1 = Circle(10)
print(c1.area, c1.perimeter)

c1.r = 3
print(c1.area, c1.perimeter)