python之 “类” 学习笔记

1 导入类

先建一个模块car.py

“”“一个可用于表示汽车的类”“”
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')

    #添加一个更新属性的方法updata_odometer,将值传给方法即可
    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

现在通过导入car.py建一个my_car.py 文件

from car import Car

my_new_car =Car('audi','a4',2016)
print(my_new_car.get_descriptive_name())

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