类的继承

class Bike:
    compose = ['frame','wheel','pedal']
    def __init__(self):
        self.other = 'basket'
    def use(self,time):
        print('you are {}m'.format(time*100))
class Share_bile(Bike):
    def cost(self,hour):
        print('you spent {}'.format(hour*2))
bike = Share_bile()
print(bike.other)
bike.cost(2)

输出：

basket

you spent 4