The Transition class contains a match() function. # Check if the state we've transitioned to is an accepting state return current_state in self.accepting_states If transition.current_state not in self.states: Self.valid_transitions = False def add_transitions( self, transitions=): """Before we use a list of transitions, verify they only apply to our states""" for transition in transitions: We can implement a Finite State Machine in Python and programmatically verify input for a given set of states and transitions: class Transition: """A change from one state to a next""" def _init_( self, current_state, state_input, next_state):ĭef match( self, current_state, state_input): """Determines if the state and the input satisfies this transition relation""" return self.current_state = current_state and self.state_input = state_inputĬlass FSM: """A basic model of computation""" def _init_( Many software solutions implement Finite State Machines to manage some aspect of states. If we're at State 2 and encounter a 1, we go to the Error state.Īs you would observe, any input in the Error state keeps it there, as you are not able to transition out of the error state.If we're at State 1 and encounter a 0, we go to the Error state.If we're at State 2 and encounter a 0, we move back to State 1.If we're at State 1 and encounter a 1, we move to State 2.Our Finite State Machine has 3 states: State 1, State 2 and Error.
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