以导入整个模块,再使用句点表示法访问需要的类。这种导入方法很简单,代码也易于阅读。由于创建类实例的代码都包含模块名,因此不会与当前文件使用的任何名称发生冲突。
main.py
最后car.py的代码:
"""A class that can be used to represent a car."""
class Car():
"""A simple attempt to represent a car."""
def __init__(self, manufacturer, model, year):
"""Initialize attributes to describe a car."""
self.manufacturer = manufacturer
self.model = model
self.year = year
self.odometer_reading = 0
def get_descriptive_name(self):
"""Return a neatly formatted descriptive name."""
long_name = str(self.year) + ' ' + self.manufacturer + ' ' + self.model
return long_name.title()
def read_odometer(self):
"""Print a statement showing the car's mileage."""
print("This car has " + str(self.odometer_reading) + " miles on it.")
def update_odometer(self, mileage):
"""
Set the odometer reading to the given value.
Reject the change if it attempts to roll the odometer back.
"""
if mileage >= self.odometer_reading:
self.odometer_reading = mileage
else:
print("You can't roll back an odometer!")
def increment_odometer(self, miles):
"""Add the given amount to the odometer reading."""
self.odometer_reading += miles
class ElectricCar(Car):
"""Models aspects of a car, specific to electric vehicles."""
def __init__(self, manufacturer, model, year):
"""
Initialize attributes of the parent class.
Then initialize attributes specific to an electric car.
"""
super(ElectricCar,self).__init__(manufacturer, model, year)
self.battery = Battery()
main.py的代码:
import car
my_beetle = car.Car('volkswagen', 'beetle', 2016)
print(my_beetle.get_descriptive_name())
my_tesla = car.ElectricCar('tesla', 'roadster', 2016)
#print(my_tesla.get_descriptive_name())
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