能找到图片,也能用鼠标点对位置,但两三次以后,就报错了,如何解决?
不知道你这个问题是否已经解决, 如果还没有解决的话:
正确的代码:
class Car():
def __init__(self,make,model,year,length):
self.make = make
self.model = model
self.year = year
self.length = length
self.odometer_reading = 0
def get_name(self):
long_name = str(self.year) + ' ' + self.make + ' ' + self.model + ' ' + self.length
return long_name.title()
def read_odometer(self):
print('this car has '+ str(self.odometer_reading) + 'KM on it.')
def updata_odometer(self,mileage):
if mileage >= self.odometer_reading:
self.odometer_reading = mileage
else:
print('you can not roll back an odometer!')
def increase_odometer(self,miles):
self.odometer_reanding += miles
class Battery():
def __init__(self, battery_size=70):
self.battery_size = battery_size
def describe_battery(self):
print('this car has a '+ str(self.battery_size) + '-KMW battery size.')
def get_range(self):
if self.battery_size == 70:
range = 240
elif self.battery_size ==85:
range = 280
message = 'this car can go approxinately ' + str(range) + 'KM on a full charge.'
print (message)
class ElectriCar(Car):
def __init__(self,make,model,year,length):
'''
初始化类,继承父类Car的属性
'''
super().__init__(make,model,year,length)
#实例化
self.battery = Battery()
my_tesla = ElectriCar('tesla','model s',2018,'4.2m')
print (my_tesla.get_name())
my_tesla.battery.describe_battery()
my_tesla.battery.get_range()
#my_tesla.battery.describe_battery(battery_size=85)
my_tesla.battery.battery_size=85
my_tesla.battery.describe_battery()
my_tesla.battery.get_range()
正确的显示: