class Car():
def __init__(self,make,model,year):
'''初始化描述汽车的属性'''
self.make=make
self.model=model
self.year=year
self.odometer_reading=0
def get_descriptive_name(self):
'''返回整洁的描述性信息'''
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')
def update_odometer(self,mileage):
self.odometer_reading = mileage
my_car=Car('audi','a4',16)
print(my_car.get_descriptive_name())
my_car.update_odometer(34)
my_car.read_odometer()
请问一下为什么这段代码里,最后方法的调用,有的要用print,有的是用句点,而且如果用print的那行代码改成句点或者句点改成print都没办法得出正确结果,为什么呢?