Add tutorial models

examples/tutorial_parallel/trafficlight.py

@@ -0,0 +1,46 @@
+from pypdevs.DEVS import *
+from pypdevs.infinity import INFINITY
+
+class TrafficLight(AtomicDEVS):
+	def __init__(self):
+		AtomicDEVS.__init__(self, "Light")
+		self.state = "green"
+		self.observe = self.addOutPort("observer")
+		self.interrupt = self.addInPort("interrupt")
+
+	def intTransition(self):
+		state = self.state
+		return {"red": "green",
+			"yellow": "red",
+			"green": "yellow"}[state]
+
+	def timeAdvance(self):
+		state = self.state
+		return {"red": 60,
+			"yellow": 3,
+			"green": 57,
+			"manual": INFINITY}[state]
+
+	def outputFnc(self):
+		state = self.state
+		if state == "red":
+			v = "green"
+		elif state == "yellow":
+			v = "red"
+		elif state == "green":
+			v = "yellow"
+		return {self.observe: [v]}
+
+	def extTransition(self, inputs):
+		inp = inputs[self.interrupt][0]
+		if inp == "manual":
+			return "manual"
+		elif inp == "auto":
+			if self.state == "manual":
+				return "red"
+
+	def confTransition(self, inputs):
+		self.elapsed = 0.0
+		self.state = self.intTransition()
+		self.state = self.extTransition(inputs)
+		return self.state