Python State Machine
PyStateMachine is a Framework that support state machines in Python
- Python3
How do we import the framework?
-
Insure that Python3 is installed:
-
Install the PyStateMachines framework
- pip3 install PyStateMachines
After framework is installed, import and create a small example. Create xml file from sample with the State machine states.
myStateMachine.xml
<?xml version="1.0"?> <x:States xmlns:x="pystatemachine:sm"> <State> <Name>State1</Name> <Event> <Name>ToState2</Name> <ToState>State2</ToState> </Event> </State> <State> <Name>State2</Name> <Event> <Name>ToState3</Name> <ToState>State3</ToState> </Event> </State> <State> <Name>State3</Name> <Event> <Name>ToState1</Name> <ToState>State1</ToState> </Event> </State> <Initial_State>State1</Initial_State> </x:States> Create Python Script to run state machine pyStateMachine.py
# importing necessary packages from StateMachine import StateMachine """Test StateMachine""" sm = StateMachine("myStateMachine.xml") sm.LoadStateMachine() # print initial state print(sm.get_current_state()) # current_state == State1 sm.InjectEvent("ToState2") print(sm.get_current_state()) # current_state == State2 sm.InjectEvent("ToState3") print(sm.get_current_state()) # current_state == State3 sm.InjectEvent("ToState1") print(sm.get_current_state()) # current_state == State1 run Python script to execute state machine
python pyStateMachine.py pyStateMachineUnitTest.py
## Test Suite # importing necessary packages from StateMachine import StateMachine import unittest class TestBaseStateMachine(unittest.TestCase): """Test state machine using various samples""" # test all valid state transitions def test1(self): """Test Statemachine""" sm = StateMachine("myStateMachine.xml") sm.LoadStateMachine() self.assertEqual(sm.get_current_state(), "State1", "Should be State1") # OK Event sm.InjectEvent("ToState2") self.assertEqual(sm.get_current_state(), "State2", "Should be State2") # OK Event sm.InjectEvent("ToState3") self.assertEqual(sm.get_current_state(), "State3", "Should be State3") # OK Event sm.InjectEvent("ToState1") self.assertEqual(sm.get_current_state(), "State1", "Should be State1") # test invalid State1 transitions def test2(self): """Test Statemachine""" sm = StateMachine("myStateMachine.xml") sm.LoadStateMachine() self.assertEqual(sm.get_current_state(), "State1", "Should be State1") # Invalid transition sm.InjectEvent("ToState3") self.assertEqual(sm.get_current_state(), "State1", "Should be State1") # test invalid State2 transitions def test3(self): """Test Statemachine""" sm = StateMachine("myStateMachine.xml") sm.LoadStateMachine() self.assertEqual(sm.get_current_state(), "State1", "Should be State1") # OK Event sm.InjectEvent("ToState2") self.assertEqual(sm.get_current_state(), "State2", "Should be State2") # Invalid transition sm.InjectEvent("ToState1") self.assertEqual(sm.get_current_state(), "State2", "Should be State2") # test invalid State3 transitions def test4(self): """Test Statemachine""" sm = StateMachine("myStateMachine.xml") sm.LoadStateMachine() self.assertEqual(sm.get_current_state(), "State1", "Should be State1") # OK Event sm.InjectEvent("ToState2") self.assertEqual(sm.get_current_state(), "State2", "Should be State2") # OK Event sm.InjectEvent("ToState3") self.assertEqual(sm.get_current_state(), "State3", "Should be State3") # Invalid transition sm.InjectEvent("ToState2") self.assertEqual(sm.get_current_state(), "State3", "Should be State3") if __name__ == '__main__': unittest.main() run unit tests
python pyStateMachineUnitTest.py 
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