python中修改类的属性的几种方法

python中修改类的属性的几种方法 示例类

class Car():
    def __init__(self, make, model, year):
        self.make = make
        self.model = model
        self.year = year
        self.odometer = 0

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

    def read_odometer(self):
        print(str(self.odometer))

1. 直接修改属性的值

my_new_car.odometer = 19
my_new_car.read_odometer()

2. 通过方法修改属性的值

#内部增加一个方法来修改属性

...
    def update_odometer(self, mileage):
        self.odometer = mileage
...

my_new_car.update_odometer(19)
my_new_car.read_odometer()

3.通过方法对属性的值进行递增

 # 内部增加一个方法来递增属性值
 
 ...
    def increment_odometer(self, miles):
        self.odometer += miles
 ...
 
my_used_car = Car('subaru', 'outback', 2013)
my_used_car.update_odometer(23500)
my_used_car.read_odometer()
my_used_car.increment_odometer(100)
my_used_car.read_odometer()