class Car():
    def __init__(self,make,model,year):
        self.make = make
        self.model = model
        self.year = year
        self.odometer = 0
    def get_descriptive_name(self):
        long_name = str(self.year) + ' ' + self.make + ' ' + self.model
        return long_name
    def read_odometer(self):
        print("This car has " + str(self.odometer) + ' miles on it')
    def update_odometer(self, mileage):
    --snip--
    def increment_odometr(self,miles):
        self.odometr_reading += miles
my_used_car = Car('subaru', 'outback', 2013)
print(my_used_car.get_descriptive_name())
my_used_car.update_odometer(23500)
my_used_car.read_odometer()
my_used_car.increment_odometr(100)
my_used_car.read_odometer()