class Car():
  """一次模擬汽車的簡單嘗試"""
  def __init__(self, make, model, year):
    """初始化描述汽車的屬性"""
    self.make = make
    self.model = model
    self.year = year
    self.odometer_reading = 0

  def get_description_name(self):
    """返回整潔的描述性信息"""
    long_name = str(self.year) + ' ' + self.make + ' ' + self.model
    return long_name.title()

  def read_odometer(self):
    """打印一條指出汽車里程的消息"""
    print("This car has " + str(self.odometer_reading) + " miles on it.")

  def update_odometer(self, mileage):
    """
    將里程讀數(shù)設(shè)置為指定的值
    禁止將里程表讀數(shù)往回調(diào)
    """
    if mileage >= self.odometer_reading:
      self.odometer_reading = mileage
    else:
      print("You can't roll back an odometer!")

  def increment_odometer(self, miles):
    """將里程表讀數(shù)增加指定的量"""
    self.odometer_reading += miles


class ElectricCar(Car):
  """電動汽車的獨特之處"""
  def _init_(self, make, model, year):
    """
    電動汽車的獨特之處
    初始化父類的屬性，再初始化電動汽車特有的屬性
    """
    super().__init__(make, model, year)
    self.battery_size = 70

  def describe_battery(self):
    """打印一條描述電瓶容量的消息"""
    print("This car has a " + str(self.battery_size) + "-kwh battery.")

my_tesla = ElectricCar('tesla', 'model s', 2016)
print(my_tesla.get_description_name())
my_tesla.describe_battery()

Traceback (most recent call last):
 File "E:/Python編程從入門到精通配套資料/Self-taught Python/electric_car.py", line 50, in <module>
  my_tesla.describe_battery()
 File "E:/Python編程從入門到精通配套資料/Self-taught Python/electric_car.py", line 46, in describe_battery
  print("This car has a " + str(self.battery_size) + "-kwh battery.")
AttributeError: 'ElectricCar' object has no attribute 'battery_size'

class Animal():
  def __init__(self, weight, high):
    self.weight = weight
    self.high = high
  def shout(self):
    print('wow')

class Dog(Animal):
  pass

dog_1 = Dog(20,40)
print(dog_1.high)
print(dog_1.weight)
dog_1.shout()
#輸出內(nèi)容是
40
20
wow

class Dog(Animal):
  def run(self):
    print('running')

dog_1 = Dog(20,40)
dog_1.run()
#輸出結(jié)果是
running

class Cat(Animal):
  def shout(self):
    print('miao')

cat_1 = Cat(20, 40)
cat_1.shout()
#輸出結(jié)果是
miao

class Cat(Animal):
  def __init__(self, weight, high, color):
    super().__init__(weight, high)
    self.color = color
  def shout(self):
    print('miao')

cat_2 = Cat(20, 40, 'yellow')
print(cat_2.color)
#輸出結(jié)果是
yellow