python:AttributeError:类没有属性‘***’

2019-03-10 03:26:33 1.9k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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初学python遇到了问题
按书上的代码敲的结果有BUG

显示这个File "D:/PycharmProjects/chapter9/electric_car.py", line 52, in <module>
my_tesla.battery.describe_battery()
AttributeError: 'ElectricCar' object has no attribute 'battery'

class Car():

def __init__(self, make, model, year):
self.make = make
self.model = model
self.year = year
self.odometer_reading = 0

def get_descriptive_name(self):
long_name = str(self.year) + ' ' + self.make + ' ' + self.model
return long_name.title()

def read_odometer(self):
print("This car has " + str(self.odometer_reading) + " miles on it.")

def update_odometer(self, mileage):
if mileage >= self.odometer_reading:
self.odometer_reading = mileage
else:
print("You can't roll backk an odometer!")

def increment_odometer(self, miles):
self.odometer_reading += miles

class Battery():
"""一次模拟电动汽车电瓶的简单尝试"""

def _init_(self, battery_size=70):
"""初始化电瓶属性"""
self.battery_size = battery_size

def describe_battery(self):
"""打印一条描述电瓶容量的消息"""
print("This car has a " + str(self.battery_size) + "-kWh battery.")

class ElectricCar(Car):
"""电动汽车的独特之处"""

def _init_(self, make, model, year):
"""
电动汽车的独特之处
初始化父类的属性，再初始化电动汽车持有的属性
"""
super()._init_(make, model, year)
self.battery = Battery()

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

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