Collaborative session implementation, 1

synctoy/state_machine.py

@@ -0,0 +1,12 @@
+from typing import Protocol
+
+
+class StateMachine(Protocol):
+    def equivalent_to(self, other: "StateMachine") -> bool:
+        raise NotImplementedError
+
+    def can_transition_from(self, old: "StateMachine") -> bool:
+        raise NotImplementedError
+
+    def can_transition_to(self, new: "StateMachine") -> bool:
+        raise NotImplementedError