class Car():
def __init__(self, make, model, year):
self.make = make
self.model = model
self.year = year
self.odometer_reading = 0
def update_odometer(self, mileage):
if mileage >= self.odometer_reading:
self.odometer_reading = mileage
else:
print("You can't roll back an odometer.")
def increment_odometer(self, miles):
self.odometer_reading += miles
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.")
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) + "-KWH battery.")
def get_range(self):
if self.battery_size == 70:
range = 240
elif self.battery_size == 85:
range = 70
message = "This car can go approximately "+str(range)
message += "miles on a full charge."
print(message)
def upgrade_battery(self):
if self.battery_size != 85:
self.battery_size = 85
class ElectricCar(Car):
def __init__(self, make, model, year):
super().__init__(make, model, year)
self.battery = Battery()
def fill_gas_tank():
print("This cr doesn't need a gas tank!")
以上时我创建的一个模块,保存为car.py,用ipython note book编辑。
我想在另外一个新建文件中导入这个模块中的Car函数,可是出错,如下: