OOP 4: Adding Methods
4.1.在Car 类内添加working_engine 类属性,并将其赋值为False 。
4.2.在Car 类中添加start_engine 方法,显示"Engine has started" 消息,并将working_engine...
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4.1.在Car 类内添加working_engine 类属性,并将其赋值为False 。
4.2.在Car 类中添加start_engine 方法,显示"Engine has started" 消息,并将working_engine...