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- 2016-5-24
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- 2016-6-2
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- class vehicle:
- def _init_(self,speed):
- self.speed = speed
- def drive(self,distance):
- print 'need %.2f time'%float(distance)/self.speed
-
- class Bike(vehicle):
- pass
- class Car(vehicle):
- def _init_(self,speed,fuel):
- vehicle._init_(self,speed)
- self.fuel = fuel
- def drive(self,distace):
- vehicle.drive(self,distace)
- print 'need %f fuel'%(distace*self.fuel)
- a = Bike(15.0)
- b = Car(80.0,0.0025)
- a.drive(50)
- b.drive(50)
复制代码 上述代码有什么问题呢?总是显示Bike类不需要参数。。。 |
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