# Please use Python to answer this question
10.4. An example: state machines
A state machine is a system that can be in one of a fewdifferent states. We draw a state diagram to represent the machine,where each state is drawn as a circle or an ellipse. Certain eventsoccur which cause the system to leave one state and transition intoa different state. These state transitions are usually drawn as anarrow on the diagram.
This idea is not new: when first turning on a cellphone, it goesinto a state which we could call “Awaiting PIN”. When the correctPIN is entered, it transitions into a
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